Revenue - Summary of Opening and Closing Balances of Company's Customer Receivables and Current and Long-term Contract Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Customer receivables	$ 82,717	$ 40,785
Contract liabilities—current	7,193	8,249
Contract liabilities—noncurrent	11,026	$ 13,106
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Customer receivables	41,932
Contract liabilities—current	(1,056)
Contract liabilities—noncurrent	$ (2,080)