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Stockholders' Equity - Stock-based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock-based compensation	$ 745	$ 589	$ 1,463	$ 1,319
Research and Development Expense [Member]
Stock-based compensation	251	84	424	177
General and Administrative Expense [Member]
Stock-based compensation	$ 494	$ 505	$ 1,039	$ 1,142

X

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

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- Details

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- Details

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