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Description of Business and Basis of Preparation - Additional Information (Detail) $ in Thousands	Jul. 16, 2020 shares	Mar. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Jul. 17, 2020 shares
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accumulated deficit		$ (331,289)	$ (326,613)
Cash and cash equivalents		$ 92,011	$ 93,041
Reverse stock split, ratio	0.1
Common stock, shares authorized (in shares) | shares	250,000,000	100,000,000	100,000,000	100,000,000

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