Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]        
Cash and cash equivalents $ 58,610 $ 93,794 $ 56,664  
Restricted cash 388 381    
Non-current restricted cash 1,040 1,113    
Total 60,038 95,288 56,664 $ 5,026
Non-cash additions to land, buildings and equipment 414 7,994 3,130  
Offering costs in accounts payable and accrued liabilities   443    
Non-cash addition to financing lease obligations 25      
Interest paid $ 1,472 $ 1,086 $ 200