Quarterly report pursuant to Section 13 or 15(d)

Condensed Financial Statements - Summary of Statements of Certain Statements of Cash Flows Amounts (Detail)

v3.19.1
Condensed Financial Statements - Summary of Statements of Certain Statements of Cash Flows Amounts (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Information Disclosure [Abstract]        
Cash and cash equivalents $ 50,703 $ 84,231 $ 93,794  
Restricted cash, current   381 381  
Non-current restricted cash   1,120 1,113  
Cash, cash equivalents, and restricted cash 50,703 $ 85,732 $ 95,288 $ 56,664
Non-cash additions to land, buildings and equipment 4,529      
Deferred cost in accounts payable and accrued liabilities 417      
Total $ 4,946