License and Royalty Revenue - Summary of Accounts Recerivable, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current accounts receivable:
Billed to customers	$ 30,584	$ 30,573
Unbilled	18,698	20,104
Allowance for credit losses	(8,243)	(7,678)
Current accounts receivable, net	41,039	42,999
Non-current accounts receivable:
Unbilled	2,859	3,267
Non-current accounts receivable, net	2,859	3,267
Total accounts receivable, net	$ 43,898	$ 46,266