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STOCK-BASED COMPENSATION (Tables) - Rocket Lab USA, Inc. | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Schedule of Stock-based Compensation Recorded in Consolidated Statements of Operations and Comprehensive Loss | Total stock-based compensation recorded related to the 2013 Plan in the condensed consolidated statements of operations and comprehensive loss during the six months ended June 30, 2021 and 2020, respectively consisted of the following:
|  | Six-Months Ended June 30, |
Stock-based compensation |  | 2021 |  |  | 2020 |
Cost of goods sold |  | $ | 604 |  |  | $ | 715 |
Research and development |  |  | 966 |  |  |  | 421 |
Selling, general and administrative |  |  | 809 |  |  |  | 787 |
Total stock-based compensation expense |  |  | 2,379 |  |  |  | 1,923 |
| Total stock-based compensation recorded in the consolidated statements of operations and comprehensive loss during the years ended December 31 consisted of the following:
|  | 2020 |  |  | 2019 |
Cost of goods sold |  | $ | 1,400 |  |  | $ | 1,394 |
Research and development |  |  | 1,183 |  |  |  | 162 |
Selling, general and administrative |  |  | 1,636 |  |  |  | 2,374 |
Total stock-based compensation expense |  | $ | 4,218 |  |  | $ | 3,930 |
Summary of Stock Option Activity |  | The following summarizes the stock option activity of the Plan for the years ended December 31:
|  | 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, 2019 |  |  | 3,093,543 |  |  | $ | 8.08 |  |  | $ | 4.22 |  |  |  | 8.68 |  |  | $ | 9,131 |
Granted |  |  | 416,549 |  |  |  | 11.83 |  |  |  | 6.84 |  |  |  |  |  |  |  |  |
Exercised |  |  | (152,247 | ) |  |  | 3.82 |  |  |  |  |  |  |  | 5.43 |  |  |  | 1,366 |
Forfeited |  |  | (254,051 | ) |  |  | 9.70 |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | (94,434 | ) |  |  | 3.15 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding — at December 31, 2019 |  |  | 3,009,360 |  |  | $ | 8.83 |  |  | $ | 4.57 |  |  |  | 7.95 |  |  | $ | 11,941 |
Granted |  |  | 10,000 |  |  |  | 12.80 |  |  |  | 7.11 |  |  |  |  |  |  |  |  |
Exercised |  |  | (305,867 | ) |  |  | 3.23 |  |  |  |  |  |  |  | 3.21 |  |  |  | 2,565 |
Forfeited |  |  | (166,479 | ) |  |  | 11.38 |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | (108,873 | ) |  |  | 9.55 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding — at December 31, 2020 |  |  | 2,438,141 |  |  | $ | 9.35 |  |  | $ | 4.81 |  |  |  | 7.12 |  |  | $ | 85,853 |
Options vested and exercisable — at December 31, 2020 |  |  | 1,626,906 |  |  | $ | 8.82 |  |  | $ | 4.44 |  |  |  | 6.83 |  |  | $ | 57,660 |
Options vested and exercisable — at December 31, 2019 |  |  | 1,310,763 |  |  |  | 7.03 |  |  | $ | 3.40 |  |  |  | 7.09 |  |  | $ | 7,552 |
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:
|  | 2020 |  |  | 2019 |
Fair value per share of common stock |  |  | 12.80 |  |  |  | 11.84 |
Expected volatility |  |  | 60.0 | % |  |  | 60.0 | %
Risk-free interest rate |  |  | 0.6 | % |  |  | 1.9% - 2.5 | %
Expected life (years) |  |  | 6.25 |  |  |  | 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:
|  | Number of Units |  |  | Weighted- Average Grant Date Fair Value |
Outstanding — at January 1, 2019 |  |  | — |  |  | $ | — |
Granted |  |  | 761,430 |  |  |  | 12.80 |
Forfeited |  |  | (8,813 | ) |  |  | 12.80 |
Outstanding — at December 31, 2019 |  |  | 752,617 |  |  |  | 12.80 |
Granted |  |  | 657,239 |  |  |  | 11.32 |
Forfeited |  |  | (103,938 | ) |  |  | 12.70 |
Outstanding — at December 31, 2020 |  |  | 1,305,918 |  |  | $ | 12.06 |
Units expected to vest — at December 31, 2020 |  |  | — |  |  | $ | — |
Units expected to vest — at December 31, 2019 |  |  | — |  |  | $ | — |

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