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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock-Based Compensation Expense
Total stock-based compensation expense recognized in the Company’s consolidated statements of operations and comprehensive loss is classified as follows (in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Cost of revenue$238 $217 $870 $725 
Research and development694 549 2,005 1,705 
Selling and marketing414 258 1,162 817 
General and administrative3,288 4,735 15,546 13,816 
Total stock-based compensation expense$4,634 $5,759 $19,583 $17,063 
Summary of Incentive Stock Units
The table below summarizes the Company’s activity and related information for its ISUs:
ISUs
Number of SharesWeighted Average Grant
Date Fair Value
Unvested at December 31, 2020
8,046,399 $3.41 
ISUs granted3,336,396 $4.82 
ISUs vested(4,396,417)$5.20 
ISUs forfeited(227,445)$3.45 
Unvested at September 30, 2021
6,758,933 $3.79 
Vested and unreleased183,569 
Outstanding at September 30, 2021
6,942,502 
Summary of Company's Stock Option Activity and Related Information
A summary of the Company’s stock option activity and related information is as follows:
Number
of Stock
Options
Outstanding
Weighted-
Average Exercise
Price
Weighted-
Average
Remaining
Contractual Life
(Years)
Aggregate
Intrinsic
Value
(In thousands)
Options outstanding at December 31, 2020
8,142,348 $7.14 7.3$2,638 
Options granted— — 
Options exercised(127,913)$4.79 
Options cancelled or forfeited(714,490)$9.15 
Options outstanding at September 30, 2021
7,299,945 $6.99 6.4$9,418 
Options exercisable at September 30, 2021
5,683,458 $7.01 6.1$7,024 
Options vested and expected to vest at September 30, 2021
7,183,948 $7.01 6.4$9,116 
Schedule of Weighted-Average Assumptions Used in Black-Scholes Option-Pricing Model to Estimate Fair Value of Employee Stock Options at Grant Date
The fair value of employee stock options was estimated at the date of grant using a Black-Scholes option-pricing model with the following weighted-average assumptions:
Nine Months Ended
September 30,
2020
Expected term (in years)6.0
Expected volatility68.8%
Risk-free interest rate0.7%
Expected dividend yield0.0%