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
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]        
Cash and cash equivalents $ 76,434 $ 105,620 $ 93,794  
Restricted cash, current 381   381  
Non-current restricted cash 1,128   1,113  
Total 77,943 105,620 $ 95,288 $ 56,664
Interest paid 737 207    
Proceeds from the sale and leaseback of land, buildings, and equipment 217      
Non-cash additions to land, buildings, and equipment   7,096    
Offering costs in accounts payable and accrued liabilities   445    
Non-cash addition to financing lease obligations 12      
Total $ 229 $ 7,541