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Common Stock (Tables) | 3 Months Ended
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Mar. 31, 2022
Equity [Abstract] |
Schedule of Common Stock Reserved for Future Issuance | Shares of common stock reserved for future issuance, on an as-if converted basis, are as follows:
| March 31, 2022 |  | December 31, 2021
| (in thousands)
2025 Notes | 5,503 |  |  | 6,078 |
2026 Notes | 10,311 |  |  | 10,311 |
Stock options issued and outstanding | 12,743 |  |  | 13,603 |
Remaining shares available for issuance under the 2019 Plan | 45,931 |  |  | 30,761 |
Outstanding and unsettled restricted stock units | 7,437 |  |  | 7,417 |
Shares available for issuance under the Employee Stock Purchase Plan | 11,293 |  |  | 8,056 |
Total shares of common stock reserved | 93,218 |  |  | 76,226 |

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