STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 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:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Selling and marketing	$	22	$	24	$	54	$	71
General and administrative	117		277		1,587		802
Research and development	694		968		2,039		1,751
Stock-based compensation expense	$	833	$	1,269	$	3,680	$	2,624
Capitalized stock-based compensation	$	184	$	73	$	502	$	375

Summary of Stock Option Activity

The following is a summary of stock option activity for time-based and performance-based options for the nine months ended September 30, 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	18,090	$	0.85
Granted	128	7.85
Exercised	(2,440)	0.85
Forfeited	(383)	1.82
Expired	(65)	1.52
Outstanding - September 30, 2021	15,330	0.88		6.6	$	17,042
Unvested - September 30, 2021	4,837	0.96		7.7	7,670
Exercisable - September 30, 2021	10,493	0.88		6.0	9,373

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:

	Nine Months Ended September 30,
	2021	2020
Expected term (in years)	5.86	5.96
Expected volatility	51.24%	59.98%
Risk-free interest rate range	0.54% – 0.60%	0.24% – 0.51%
Dividend yield	0%	0%
Grant-date fair value	$4.01	$1.40