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Stock-Based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Employee and non-employee stock options |  |
Stock based compensation expense |  |
Options granted (in shares) | 150,000 |
Stock-based compensation expense | $ 23,232 | $ 7,417
Unrecognized compensation expense | $ 215,400 |
Unrecognized compensation expense, weighted average period of recognition | 2 years 9 months 18 days |
Employee and non-employee stock options | Cost of revenues |  |
Stock based compensation expense |  |
Stock-based compensation expense | $ 708 | 314
Employee and non-employee stock options | Research and development |  |
Stock based compensation expense |  |
Stock-based compensation expense | 3,874 | 1,842
Employee and non-employee stock options | Selling, general and administrative |  |
Stock based compensation expense |  |
Stock-based compensation expense | 18,650 | 5,261
Employee stock options |  |
Stock based compensation expense |  |
Stock-based compensation expense | 22,962 | 7,248
Employee stock options | Cost of revenues |  |
Stock based compensation expense |  |
Stock-based compensation expense | 708 | 314
Employee stock options | Research and development |  |
Stock based compensation expense |  |
Stock-based compensation expense | 3,650 | 1,682
Employee stock options | Selling, general and administrative |  |
Stock based compensation expense |  |
Stock-based compensation expense | $ 18,604 | 5,252
Non-employee stock options |  |
Stock based compensation expense |  |
Options granted (in shares) | 34,376 |
Options unvested (in shares) | 2,917 |
Stock-based compensation expense | $ 270 | 169
Non-employee stock options | Research and development |  |
Stock based compensation expense |  |
Stock-based compensation expense | 224 | 160
Non-employee stock options | Selling, general and administrative |  |
Stock based compensation expense |  |
Stock-based compensation expense | $ 46 | $ 9

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