Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Significant Accounting Policies - Summary of Contract Liabilities (Detail)

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Significant Accounting Policies - Summary of Contract Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Contract Liabilities, Current    
Deferred Revenue, Current $ 996 $ 291
Customer Advance Payment 665 172
Total 1,661 463
Contract Liabilities, Long-Term    
Deferred Revenue, Long-Term 3,473 3,473
Total Contract Liabilities $ 5,134 $ 3,936