STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of Stock-based Compensation Expense

The following table summarizes stock-based compensation expense that the Company recorded in income (loss) from operations for the periods shown:

	Years Ended December 31,
	2021		2020		2019
Selling and marketing	$	72	$	94	$	85
General and administrative	1,704		1,044		964
Research and development	2,679		2,381		4,835
Stock-based compensation expense	$	4,455	$	3,519	$	5,884
Capitalized stock-based compensation	$	657	$	605	$	912

Summary of Stock Option Activity

The following is a summary of stock option activity for time-based options for the year ended December 31, 2021 (in thousands, except weighted-average exercise price and remaining term):

	No. of Options	Weighted-Average Exercise Price		Weighted-Average Remaining Term (in Years)	Aggregate Intrinsic Value
Outstanding - December 31, 2020	18,093	$	0.85
Granted	128	7.85
Exercised	(2,676)	0.90
Forfeited	(658)	1.90
Expired	(138)	1.63
Outstanding - December 31, 2021	14,749	0.85		6.3	$	46,246
Unvested - December 31, 2021	3,875	0.88		7.5	12,299
Exercisable - December 31, 2021	10,874	0.84		5.8	33,947

Schedule of Weighted-average Assumptions

The following table presents the weighted-average assumptions used to estimate the fair value of the stock options granted in the Company’s consolidated financial statements:

	For the Years Ended December 31,
	2021	2020	2019
Expected term (in years)	5.86	5.96	5.93
Expected volatility	51.24%	59.56%	70.00%
Risk-free interest rate range	0.54% – 0.60%	0.24% – 0.51%	1.54% – 2.59%
Dividend yield	0%	0%	0%
Grant-date fair value	$4.01	$0.60	$0.27