Background - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) Segment	Dec. 31, 2021 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Entity incorporation date	Nov. 15, 2007
Accumulated deficit | $	$ 253,137	$ 245,754
Number of operating segment | Segment	1