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STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity
A summary of the status of the 2015 Plan and 2021 Plan as of December 31, 2021 and March 31, 2022, and changes during the three month period ended March 31, 2022, is presented below:
Options Outstanding
Number of OptionsWeighted-Average Exercise PriceWeighted-Average Remaining Contractual Term
(in years)
Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 202116,370,673 $4.23 7.70$177,593 
Granted283,608 10.92 
Exercised(1,346,038)1.09 8,629 
Forfeited(208,288)4.69 
Cancelled(11,478)3.37 
Outstanding at March 31, 202215,088,477 4.63 7.1131,231 
Vested and exercisable at March 31, 20227,407,011 2.92 5.6723,316 
Unvested at March 31, 20227,681,466 $6.28 7.91$31,231 
Schedule of Stock-based Compensation Expense
Stock-based compensation expense, included in selling, general, and administrative expense in the condensed consolidated statements of operations and comprehensive loss for the three months ended March 31, 2022 and 2021, was comprised of the following:
Three Months Ended March 31,
(in thousands)20222021
Stock-based compensation expense, net of amounts capitalized$3,560 $1,684 
Capitalized stock-based compensation expense261 — 
Total stock-based compensation expense$3,821 $1,684 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The following weighted average assumptions were used for issuances during the three months ended March 31, 2022 and 2021, for employees and non-employees:
Employees and Non-employees—
Three Months Ended March 31,
20222021
Risk-free interest rate1.98 %0.89 %
Dividend yield— — 
Volatility47.14 %52.04 %
Expected lives (years)6.15.9
Fair value of common stock$10.92 $4.58 
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
The following table summarizes the weighted-average assumptions used in estimating the fair value of the 2021 ESPP grants for the offering period beginning on November 3, 2021, using the Black Scholes option-pricing model:
March 31,
2022
Risk-free interest rate1.63 %
Dividend yield— 
Volatility63.00 %
Expected lives (years)0.6
Fair value of common stock$21.04 
Share-based Payment Arrangement, Restricted Stock Unit, Activity
RSU activity during the three months ended March 31, 2022 was as follows:
Number of SharesWeighted-Average Grant Date Fair Value per Share
Unvested at December 31, 2021
160,227 $22.33 
Granted628,991 7.70 
Vested— — 
Forfeited(3,085)19.64 
Cancelled— — 
Unvested at March 31, 2022
786,133 $10.63