Interim Consolidated Financial Statements - Summary of End-of-period Cash and Cash Equivalents and Cash, Cash Equivalents and Restricted Cash from Financial Statements (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 125,600	$ 90,257	$ 69,815
Restricted cash, current	$ 360		$ 787
Restricted Cash, Current, Asset, Statement of Financial Position [Extensible List]	Prepaid expenses and other current assets		Prepaid expenses and other current assets
Restricted cash, non-current	$ 2,306		$ 38
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]	Other assets		Other assets
Cash, cash equivalents and restricted cash shown in statement of cash flows	$ 128,266		$ 70,640