XML 41 R31.htm IDEA: XBRL DOCUMENT v3.19.2
Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 41,917 $ 45,414
Accounts receivable, net 14,904 12,140
Accounts payable 3,187 3,235
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 41,917 45,414
Accounts receivable, net 14,904 12,140
Accounts payable $ 3,187 $ 3,235