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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
Stock-based compensation expense included in the condensed consolidated statements of operations was as follows:
For the Three Months EndedFor the Six Months Ended
June 30, 2022
June 30, 2021
June 30, 2022
June 30, 2021
Stock options$509 $1,025 $1,420 $2,547 
Restricted stock units 2,925 2,170 5,957 3,126 
Total$3,434 $3,195 $7,377 $5,673 
The stock compensation expense has been recorded in cost of goods sold, research and development expenses, and selling, general and administrative expenses in the condensed consolidated statements of operations.
The following table summarizes stock option activity for the six months ended June 30, 2022:
 UnitsWeighted-Average
Exercise Price		Weighted-Average
Remaining
Contractual Term
(years)
Options Outstanding at December 31, 20212,023,460 $9.51 6.3
Granted2,870,108 $1.29 
Cancelled/Forfeited(135,808)$9.28 
Options Outstanding at June 30, 20224,757,760 $4.56 8.1
Options Exercisable at June 30, 20221,415,703 $9.76 5.4
A summary of restricted stock units (RSUs) activity during the six months ended June 30, 2022 is as follows:
 UnitsWeighted-Average
Grant-Data Fair Value
RSUs Outstanding at December 31, 20212,194,756 $16.36 
Granted1,950,734 $3.24 
Cancelled/Forfeited(394,850)$11.09 
Vested(427,607)$17.83 
RSUs Outstanding at June 30, 2022
3,323,033 $9.09 
In 2022, the Company reserved an additional 2,537,866 shares for the Amended and Restated 2020 Incentive Plan. As of June 30, 2022 and December 31, 2021, 530,588 and 2,282,906 shares remain for future issuance, respectively. Options vesting can vary from three months to five years and have a term of five to ten years. RSUs generally vest over three to four years. During the six months ended June 30, 2022, the Company granted 75,000 RSUs and 2,000,000 options with performance and service conditions. Stock compensation is recognized on a straight-line basis over the requisite service period of the award, which is generally the award vesting term. For awards with performance conditions, compensation expense is recognized using an accelerated attribution method over the vesting period. The performance conditions primarily relate to achievement of sales and financing targets. As of June 30, 2022, within the total awards outstanding, there were 2,028,818 and 75,000 performance-based stock options and RSUs, respectively, all of which are expected to vest in the next four years.
Unrecognized stock compensation expenses amounted to $26,539 and included $23,051 attributable to RSUs and $3,488 attributable to stock options. The weighted average vesting period for the stock options and RSUs was 0.8 years and 1.9 years as of June 30, 2022, respectively.
The weighted average assumptions used to determine the fair value of options granted in the six months ended June 30, 2022 and 2021 were as follows:
 20222021
Volatility61.29 %57.31 %
Risk free interest rate3.18 %1.09 %
Expected life (years)4.606.13
Dividend yield0 %0 %
The RSUs issued were valued at the stock prices of the Company on the date of grant.
The weighted average grant date fair value of all options granted was $0.68 and $9.08 per option for the six months ended June 30, 2022 and 2021.