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EQUITY INCENTIVE PLANS (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

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

The following table summarizes RSU and PRSU activity during the year ended December 31, 2023:

			Number of RSUs and PRSUs						Weighted Average Grant Date Fair Value
Outstanding at December 31, 2022			1,223,871						$	1.47
RSUs and PRSUs granted			1,515,817						1.00
RSUs and PRSUs vested			(490,520)						1.48
RSUs and PRSUs canceled			(151,115)						1.29
Outstanding at December 31, 2023			2,098,053						$	1.14

Schedule of Stock Option Activity

The following table summarizes stock option activity during the year ended December 31, 2023:

			Number of Shares						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life in Years						Total Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2022			8,099,624						$	2.78					6.65						$	48
Options granted			3,233,558						1.02
Options exercised			(25,750)						0.83
Options canceled			(641,417)						3.12
Outstanding at December 31, 2023			10,666,015						$	2.23					6.72						$	57
Vested and expected to vest at December 31, 2023			10,666,015						$	2.23					6.72						$	57
Exercisable at December 31, 2023			7,236,987						$	2.75					5.71						$	54

Schedule of Black-Scholes Option Pricing Model Assumptions

The following table summarizes the Black-Scholes option pricing model assumptions used to estimate the fair value of stock options granted to employees under the 2015 EIP and 2020 IIP and the shares purchasable under the 2015 ESPP during the periods presented:

			For the years ended December 31,
			2023						2022
2015 EIP and 2020 IIP
Risk-free interest rate			3.58% - 4.61%						1.39% - 4.02%
Expected dividend yield			0%						0%
Expected volatility			82% - 83%						70% - 75%
Expected term (years)			5.50 - 6.08						5.50 - 6.08
2015 ESPP
Risk-free interest rate			4.29% - 5.43%						1.57% - 2.65%
Expected dividend yield			0%						0%
Expected volatility			64% - 147%						75% - 98%
Expected term (years)			0.50 - 2.00						0.50 - 2.00

Schedule of Stock-Based Compensation Expense

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

			Years ended December 31,
			2023						2022
Research and development			$	1,592					$	1,760
Selling, general and administrative			1,469						1,945
Total			$	3,061					$	3,705

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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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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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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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