Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net - Summary of Intangible Assets (Detail)

v3.20.1
Intangible Assets, Net - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Cost of intangible assets gross, beginning balance $ 46,527 $ 25,027 $ 25,027
Disposal (6)    
Cost of intangible assets gross, ending balance 46,521   46,527
Accumulated amortization, beginning balance (17,241) (15,134) (15,134)
Amortization expense (703) (348) (2,107)
Disposal 5    
Accumulated amortization, ending balance (17,939)   (17,241)
Net book value $ 28,582   29,286
Minimum      
Useful lives 3 years    
Maximum      
Useful lives 20 years    
Cortina Asset Management, LLC      
Acquisition of Cortina     21,500
Customer Relationships      
Cost of intangible assets gross, beginning balance $ 44,060 22,560 22,560
Cost of intangible assets gross, ending balance 44,060   44,060
Accumulated amortization, beginning balance (14,833) (12,887) (12,887)
Amortization expense (663)   (1,946)
Accumulated amortization, ending balance (15,496)   (14,833)
Net book value $ 28,564   $ 29,227
Customer Relationships | Minimum      
Useful lives 10 years   10 years
Customer Relationships | Maximum      
Useful lives 20 years   20 years
Customer Relationships | Cortina Asset Management, LLC      
Acquisition of Cortina     $ 21,500
Other Intangible Assets      
Cost of intangible assets gross, beginning balance $ 2,467 2,467 2,467
Disposal (6)    
Cost of intangible assets gross, ending balance 2,461   2,467
Accumulated amortization, beginning balance (2,408) $ (2,247) (2,247)
Amortization expense (40)   (161)
Disposal 5    
Accumulated amortization, ending balance (2,443)   (2,408)
Net book value $ 18   $ 59
Other Intangible Assets | Minimum      
Useful lives 3 years   3 years
Other Intangible Assets | Maximum      
Useful lives 5 years   5 years