Quarterly report pursuant to Section 13 or 15(d)

Investments and Fair Value Measurements - Category of Financial Instruments Not Held at Fair Value (Detail)

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Investments and Fair Value Measurements - Category of Financial Instruments Not Held at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Investments $ 777 $ 1,781
Carrying Amount | Level I    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Cash and cash equivalents 37,679 52,832
Carrying Amount | Level II    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Liabilities, Borrowings under credit facility 14,400 16,200
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Investments 777 1,781
Fair Value | Level I    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Cash and cash equivalents 37,679 52,832
Fair Value | Level II    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Liabilities, Borrowings under credit facility $ 14,400 $ 16,200