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Summary of Stock-Based Compensation Recognized (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation		$ 3,627	$ 3,204
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation		1,487	1,052
General and Administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	[1]	$ 2,140	$ 2,152
[1] Included in general and administrative stock-based compensation for the years ended December 31, 2020 and 2019 is $0.3 million and $0.2 million in expense related to 51,056 shares and 24,235 shares of common stock, respectively, issued to certain board members in lieu of their cash compensation.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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