Quarterly report pursuant to Section 13 or 15(d)

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

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Condensed Financial Statements - Summary of Statements of Certain Statements of Cash Flows Amounts (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]        
Cash and cash equivalents $ 66,434 $ 101,796 $ 93,794  
Restricted cash, current 381 50 381  
Non-current restricted cash 1,135   1,113  
Total 67,950 101,846 $ 95,288 $ 56,664
Interest paid 1,108 856    
Non-cash additions to land, buildings, and equipment 414 6,849    
Offering costs in accounts payable and accrued liabilities   $ 443    
Non-cash addition to financing lease obligations $ 18