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Supplemental Information - Summary of Statements of Certain Statements of Cash Flows Amounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]        
Cash and cash equivalents $ 17,299 $ 58,610 $ 93,794  
Restricted cash 393 388 381  
Non-current restricted cash 597 1,040 1,113  
Cash, cash equivalents, and restricted cash 18,289 60,038 95,288 $ 56,664
Short-term investments 11,698      
Total 29,987 60,038 95,288  
Non-cash additions to land, buildings, and equipment   414 7,994  
Offering costs in accounts payable and accrued liabilities     443  
Non-cash addition to financing lease obligations 37 25    
Interest paid $ 1,455 $ 1,472 $ 1,086