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EQUITY INCENTIVE PLANS (Tables)

9 Months Ended

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

Summary of Restricted Stock Units and Performance-based Restricted Stock Units Activity

The following table summarizes RSU and PRSU activity during the nine months ended September 30, 2022:

			Number of RSUs and PRSUs						Weighted Average Grant Date Fair Value
Outstanding at December 31, 2021			1,174,087						$	2.53
RSUs and PRSUs granted			1,471,454						0.83
RSUs and PRSUs vested			(1,032,815)						1.59
RSUs and PRSUs canceled			(320,532)						2.06
Outstanding at September 30, 2022			1,292,194						$	1.47

Summary of Stock Option Activity

The following table summarizes stock option activity during the nine months ended September 30, 2022:

			Number of Shares						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life in Years						Total Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2021			8,296,091						$	3.21					6.31						$	—
Options granted			2,014,700						0.80
Options exercised			—						—
Options canceled			(1,516,146)						2.72
Outstanding at September 30, 2022			8,794,645						$	2.74					6.46						$	19
Vested and expected to vest at September 30, 2022			8,794,645						$	2.74					6.45						$	19
Exercisable at September 30, 2022			5,749,660						$	3.38					5.32						$	—

Schedule of Stock-based Compensation Expense

Stock-based compensation expense recognized for restricted shares, RSUs, PRSUs, stock options, and the ESPP has been reported in the statements of operations as follows (in thousands):

			Three Months Ended September 30,												Nine Months Ended September 30,
			2022						2021						2022						2021
Research and development			$	443					$	425					$	1,366					$	1,215
General and administrative			399						476						1,666						1,436
Total			$	842					$	901					$	3,032					$	2,651

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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