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EQUITY INCENTIVE PLANS (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 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			1,466,954						0.83
RSUs and PRSUs vested			(749,254)						1.34
RSUs and PRSUs canceled			(48,159)						2.86
Outstanding at March 31, 2022			1,843,628						$	1.65

Summary of Stock Option Activity

The following table summarizes stock option activity during the three months ended March 31, 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			1,804,700						0.83
Options exercised			—						—
Options canceled			(1,096,423)						3.12
Outstanding at March 31, 2022			9,004,368						$	2.74					7.53						$	4
Vested and expected to vest at March 31, 2022			9,004,368						$	2.74					7.53						$	4
Exercisable at March 31, 2022			4,609,717						$	3.75					5.86						$	—

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 March 31,
			2022						2021
Research and development			$	455					$	391
General and administrative			883						488
Total			$	1,338					$	879

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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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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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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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