Equity-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
1 Months Ended |
3 Months Ended |
9 Months Ended |
12 Months Ended |
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Aug. 31, 2021 |
May 31, 2021 |
Jan. 31, 2021 |
May 31, 2020 |
Mar. 31, 2020 |
May 31, 2019 |
Oct. 31, 2018 |
May 31, 2016 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
Nov. 02, 2012 |
| Class A Common Stock |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units granted |
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13,462
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8,242
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| Class B Common Stock |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units granted |
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170,854
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| Non-Qualified Stock Options |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units granted |
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86,764
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60,742
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105,398
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| Restricted stock units\non-qualified stock options, granted description |
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One third of the NQOs will vest and become exercisable on each of the first, second and third anniversaries of the grant date.
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One third of the NQOs will vest and become exercisable on each of the first, second and third anniversaries of the grant date.
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| Fair value assumptions, strike price |
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$ 10.18
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$ 14.54
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$ 13.97
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| Fair value assumptions, risk free rate |
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0.64%
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2.32%
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2.94%
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| Fair value assumptions, expiration |
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10 years
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5 years
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5 years
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| Fair value assumptions, volatility |
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48.00%
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34.20%
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32.70%
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| Compensation expense forfeiture rate |
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1.00%
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1.00%
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1.00%
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| Compensation expense |
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$ 1,107
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$ 192
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$ 1,107
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$ 456
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| Recognition period of unrecognized compensation expense related to unvested awards |
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1 year 9 months 25 days
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1 year 5 months 8 days
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| Unrecognized compensation expense related to unvested awards |
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$ 2,356
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$ 2,356
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$ 1,342
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| Restricted Stock Units |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units granted |
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152,739
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57,358
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| Compensation expense |
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344
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$ 192
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$ 1,107
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$ 456
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| Unrecognized compensation expense related to unvested awards |
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$ 2,356
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$ 2,356
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$ 1,342
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| Recognition period of unrecognized compensation expense related to unvested awards |
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1 year 9 months 25 days
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1 year 5 months 8 days
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| 2012 Equity Incentive Plan |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Shares reserved for issuance |
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192,689
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192,689
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| Shares reserved for issuance, authorized |
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1,687,500
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| Restricted stock units granted |
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3,791
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| Fair Value per unit |
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$ 13.19
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| Restricted stock units\non-qualified stock options, granted description |
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Twenty-five percent of the RSUs granted vested and settled on each of the first, second, third and fourth anniversaries of the grant date.
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| 2012 Equity Incentive Plan | Employee |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units granted |
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116,823
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21,598
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49,116
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34,388
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7,582
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| Fair Value per unit |
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$ 13.91
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$ 13.89
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$ 10.11
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$ 14.54
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$ 13.19
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| Restricted stock units\non-qualified stock options, granted description |
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Twenty-five percent of the RSUs granted vested and settled on each of the first, second, third and fourth anniversaries of the grant date
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| 2012 Equity Incentive Plan | Employee | Class A Common Stock |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units granted |
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856
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| Fair Value per unit |
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$ 14.61
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| 2012 Equity Incentive Plan | Employee | Class B Common Stock |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units granted |
1,827
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11,635
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| Fair Value per unit |
$ 15.96
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$ 14.61
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| 2012 Equity Incentive Plan | Employee | Restricted Stock Units |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units\non-qualified stock options, granted description |
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Twenty-five percent of the RSUs granted vest and settle on each of the first, second, third and fourth anniversaries of the grant date
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| 2012 Equity Incentive Plan | Employee | Restricted Stock Units | Class B Common Stock |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units\non-qualified stock options, granted description |
The RSUs vest and settle on the third anniversary of the grant date
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One third of the RSUs granted vest and settle on each of the first, second and third anniversaries of the grant date
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| 2012 Equity Incentive Plan | Board of Directors |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units granted |
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8,242
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| Fair Value per unit |
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$ 11.83
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| 2012 Equity Incentive Plan | Board of Directors | Restricted Stock Units |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units\non-qualified stock options, granted description |
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All of the RSUs granted vest on the third anniversary of the grant date
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| 2012 Equity Incentive Plan | Board of Directors |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock units granted |
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3,000
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| Fair Value per unit |
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$ 13.19
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| Restricted stock units\non-qualified stock options, granted description |
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One hundred percent of the RSUs granted vested and settled on the first anniversary of the grant date.
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| 2012 Equity Incentive Plan | First Anniversary |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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25.00%
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| 2012 Equity Incentive Plan | First Anniversary | Employee |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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25.00%
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25.00%
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25.00%
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25.00%
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| 2012 Equity Incentive Plan | First Anniversary | Board of Directors |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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0.33%
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| 2012 Equity Incentive Plan | First Anniversary | Board of Directors |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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100.00%
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| 2012 Equity Incentive Plan | Second Anniversary |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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25.00%
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| 2012 Equity Incentive Plan | Second Anniversary | Employee |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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25.00%
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25.00%
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25.00%
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25.00%
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| 2012 Equity Incentive Plan | Second Anniversary | Board of Directors |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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0.33%
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| 2012 Equity Incentive Plan | Third Anniversary |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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25.00%
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| 2012 Equity Incentive Plan | Third Anniversary | Employee |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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25.00%
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25.00%
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25.00%
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25.00%
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| 2012 Equity Incentive Plan | Third Anniversary | Board of Directors |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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0.33%
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| 2012 Equity Incentive Plan | Fourth Anniversary |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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25.00%
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| 2012 Equity Incentive Plan | Fourth Anniversary | Employee |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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25.00%
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25.00%
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25.00%
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25.00%
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| 2012 Equity Incentive Plan | Fourth Anniversary | Board of Directors |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Restricted stock, vesting percentage |
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0.33%
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