Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Loss Contingencies [Line Items]
Earnout Amounts Paid			$ 1,000
Share-based Payment Arrangement, Expense	$ 25,582	$ 570	27,236	$ 1,756
Selling, General and Administrative Expenses [Member]
Loss Contingencies [Line Items]
Share-based Payment Arrangement, Expense	23,196	$ 570	24,791	$ 1,756
2015 Agreement [Member] | Selling, General and Administrative Expenses [Member]
Loss Contingencies [Line Items]
Share-based Payment Arrangement, Expense	15,600
Maximum [Member]
Loss Contingencies [Line Items]
Earnout Amounts Payable	$ 9,100		$ 9,100