Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail)

v3.19.1
Financial Instruments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financial Instruments Disclosure [Abstract]        
Cash and cash equivalents $ 56,168 $ 60,698    
Restricted cash - short-term 194 194    
Restricted cash - long-term 1,200 1,200    
Total cash, cash equivalents and restricted cash $ 57,562 $ 62,092 $ 91,889 $ 80,617