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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of stock option activity
A summary of the stock option activity under the 2018 Plan is as follows:
Number of OptionsWeighted- Average Exercise PriceWeighted- Average Remaining Contractual Term (years)Aggregate Intrinsic Value (in thousands)
Balance – December 31, 20202,594,597 $3.79 8.5$13,791 
Granted(1)
965,944 10.52 
Forfeited— — 
Cancelled— — 
Balance – March 31, 20213,560,541 $5.61 8.4$49,765 
Exercisable – March 31, 20212,594,597 $3.79 7.9$41,004 
(1)     The options granted during the period were not included in the number of options for which vesting was accelerated as part of the Business Combination.
Schedule of restricted stock unit activity
A summary of restricted stock unit activity under the 2018 Plan is as follows:
Number of AwardsWeighted- Average Grant Date Fair Value per Share
Unvested and outstanding balance at December 31, 2020313,976 $4.30 
Granted— — 
Vested(313,976)4.30 
Forfeited— — 
Unvested and outstanding balance at March 31, 2021— $— 
Schedule of assumptions used to determine fair value of options granted
We estimated the fair value of each option on the date of grant using the Black-Scholes option pricing model applying the weighted-average assumptions in the following table:
Three Months Ended March 31,
20212020
Fair value of common stock$10.52
$3.94 – $4.17
Expected term, in years5.86
5.88 – 6.06
Expected volatility47%40%
Risk-free interest rate0.57%
1.45% – 1.46%
Expected dividend yield0%0%
Schedule of allocated share-based compensation expense
Stock-based compensation expense under our 2018 Plan was as follows for the three months ended March 31, 2021 and 2020 (in thousands):
Three Months Ended March 31,
20212020
Cost of sales$— $
Selling and administrative expenses3,498 744 
Total$3,498 $749