STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Option Activity

A summary of stock option activity related to the Plans as of December 31, 2023 is as follows:

	Outstanding Stock Options	Weighted Average Exercise Price		Weighted Average Contractual Life (Years)	Aggregate Intrinsic Value
Balance at December 31, 2022	846,451	$	14.94	6.45	$	2,277
Granted	—	—
Exercised	(81,814)	5.57
Forfeited	(111,937)	18.78
Expired	(363,685)	18.77
Repurchased	—	—
Balance at December 31, 2023	289,015	$	11.29	3.07	$	—
Vested and expected to vest as of December 31, 2023	289,015	$	11.29	3.07	$	—
Vested and exercisable as of December 31, 2023	281,380	$	11.09	2.97	$	—

Schedule of RSU Activity

The following table summarizes the RSU award activity under the Plans:

	Shares	Weighted Average Grant date Fair Value per Share
Unvested at December 31, 2022	425,703	$	119.85
Granted	901,472	10.66
Forfeited	(344,061)	67.82
Vested	(330,661)	53.07
Unvested at December 31, 2023	652,453	$	30.29

Schedule of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense recorded in each financial statement line item in the Company’s consolidated statements of operations and comprehensive loss for the year ended December 31, 2023 and 2022 (in thousands):

	Twelve months ended December 31,
	2023		2022
Research and development	$	6,821	$	7,201
Sales and marketing	2,993		4,696
General and administrative	8,121		11,931
Cost of revenue	136		131
Total stock-based compensation	$	18,071	$	23,959

Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The following table summarizes the range of valuation assumptions used in estimating the fair value of the ESPP during the period:

	Twelve months ended December 31, 2023
Expected term (years)	0.50 -2.00
Expected volatility	107.3% - 136.0%
Risk-free interest rate	4.1% - 5.1%
Dividend yield	—	%

The following table summarizes the valuation assumptions used in estimating the fair value of awards granted during the period with a market condition:

	Twelve months ended December 31, 2023
Expected term (years)	1.05
Expected volatility	104.5	%
Risk-free interest rate	4.8	%
Dividend yield	—	%