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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 64,046 $ 63,255
Accounts receivable, net 15,232 11,870
Accounts payable 2,778 2,514
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 64,046 63,255
Accounts receivable, net 15,232 11,870
Accounts payable $ 2,778 $ 2,514