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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-based Compensation Recorded in Consolidated Statements of Operations and Comprehensive Loss | Total stock-based compensation recorded in the consolidated statements of operations and comprehensive loss during the years ended December 31, 2021 and 2020 consisted of the following:
|  | Years Ended December 31, |
|  | 2021 |  |  | 2020 |
Cost of revenues |  | $ | 10,996 |  |  | $ | 1,400 |
Research and development |  |  | 9,973 |  |  |  | 1,183 |
Selling, general and administrative |  |  | 11,588 |  |  |  | 1,635 |
Total stock-based compensation expense |  | $ | 32,557 |  |  | $ | 4,218 |
Summary of Stock Option Activity | The following summarizes the stock option activity of the 2013 Plan for the years ended December 31, 2021 and 2020:
|  | Options to Purchase Common Stock |  |  | Weighted- Average Exercise Price per Share |  |  | Weighted- Average Grant Date Fair Value per Share |  |  | Weighted- Average Remaining Contract Life (In Years) |  |  | Aggregate Intrinsic Value |
Outstanding — at January 1, 2020 |  |  | 27,263,775 |  |  | $ | 0.97 |  |  | $ | 0.50 |  |  |  | 7.95 |  |  | $ | 11,941 |
Granted |  |  | 90,597 |  |  |  | 1.41 |  |  |  | 0.78 |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,771,051 | ) |  |  | 0.36 |  |  |  |  |  |  |  | 3.21 |  |  |  | 2,565 |
Forfeited |  |  | (1,508,243 | ) |  |  | 1.26 |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | (986,352 | ) |  |  | 1.05 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding — at December 31, 2020 |  |  | 22,088,726 |  |  | $ | 1.03 |  |  | $ | 0.53 |  |  |  | 7.12 |  |  | $ | 85,853 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (3,708,786 | ) |  |  | 1.00 |  |  |  | 0.51 |  |  |  | 4.32 |  |  |  | 41,822 |
Forfeited |  |  | (857,579 | ) |  |  | 1.21 |  |  |  | 0.60 |  |  |  | 0.01 |  |  |  | 9,131 |
Expired |  |  | (177,033 | ) |  |  | 1.16 |  |  |  | 0.31 |  |  |  | — |  |  |  | 1,969 |
Outstanding — at December 31, 2021 |  |  | 17,345,328 |  |  | $ | 1.03 |  |  | $ | 0.54 |  |  |  | 6.03 |  |  | $ | 195,111 |
Options vested and exercisable — at December 31, 2021 |  |  | 15,112,440 |  |  | $ | 1.01 |  |  | $ | 0.52 |  |  |  | 5.90 |  |  | $ | 170,320 |
Options vested and exercisable — at December 31, 2020 |  |  | 14,739,214 |  |  | $ | 0.97 |  |  | $ | 0.49 |  |  |  | 6.83 |  |  | $ | 57,660 |
Summary of Weighted-average Assumptions | The following weighted-average assumptions were used in the Black-Sholes option-pricing model calculation for stock options granted for the years ended December 31, 2021 and 2020:
|  | 2021 |  |  | 2020 |
Fair value per share of common stock |  | $ | — |  |  | $ | 1.41 |
Expected volatility |  |  | — | % |  |  | 60.0 | %
Risk-free interest rate |  |  | — | % |  |  | 0.6 | %
Expected life (years) |  |  | — |  |  |  | 6.25 |
Dividend rate |  |  | None |  |  |  | None |
Summary of Performance-based Restricted Stock Unit Activity | The following summarizes the performance-based restricted stock unit activity of the Plan for the years ended December 31, 2021 and 2020:
|  | Number of Units |  |  | Weighted- Average Grant Date Fair Value |
Outstanding — at January 1, 2020 |  |  | 6,818,453 |  |  | $ | 1.41 |
Granted |  |  | 5,954,361 |  |  |  | 1.25 |
Forfeited |  |  | (941,759 | ) |  |  | 1.40 |
Outstanding — at December 31, 2020 |  |  | 11,831,055 |  |  |  | 1.33 |
Granted |  |  | 6,542,426 |  |  |  | 9.68 |
Forfeited |  |  | (1,426,559 | ) |  |  | 2.10 |
Outstanding — at December 31, 2021 |  |  | 16,946,922 |  |  | $ | 4.49 |
Units expected to vest — at December 31, 2021 |  |  | 16,946,922 |  |  | $ | 4.49 |
Units expected to vest — at December 31, 2020 |  |  | — |  |  | $ | — |

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