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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 62,450 $ 63,255
Accounts receivable, net 11,340 11,870
Accounts payable 2,790 2,514
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 62,450 63,255
Accounts receivable, net 11,340 11,870
Accounts payable $ 2,790 $ 2,514