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Nature of the Business - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Net income loss	$ (9,794)	$ (7,384)	$ (18,165)	$ (15,857)	$ (32,800)
Retained earnings accumulated deficit	(165,142)		(165,142)		(146,977)
Cash and cash equivalents, at carrying value	$ 36,425		$ 36,425		$ 45,001

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