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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Feb. 10, 2023 | Feb. 13, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Transfer of Assets From Level 1 to Level 2 | $ 0 | $ 0 |  |
Transfer of Assets From Level 2 to Level 1 | 0 | 0 |  |
Transfer of Liabilities From Level 1 to Level 2 | 0 | 0 |  |
Transfer of Liabilities From Level 2 to Level 1 | 0 | 0 |  |
Transfer of Assets Into Level 3 | 0 | 0 |  |
Transfer of Assets Out of Level 3 | 0 | 0 |  |
Transfer of Liabilities Into Level 3 | 0 | 0 |  |
Transfer of Liabilities Out of Level 3 | 0 | 0 |  |
Marketable securities | 71,601 |  |  |
Total assets measured at fair value | 153,629 | 172,590 |  |
Convertible senior notes, carrying value | $ 262,125 | 140,873 |  |
2026 Convertible Notes |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Interest rate (as a percent) | 2.625% |  |  | 2.625%
Convertible senior notes, fair value | $ 25,033 |  |  |
Convertible senior notes, carrying value | $ 25,992 |  |  |
2029 Convertible Notes |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Interest rate (as a percent) | 2.875% |  | 2.875% |
Convertible senior notes, fair value | $ 249,803 |  |  |
Convertible senior notes, carrying value | 236,133 |  |  |
Corporate debt securities |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Marketable securities | 41,612 |  |  |
U.S. Treasury securities |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Marketable securities | 25,468 |  |  |
Government-sponsored securities |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Marketable securities | 4,521 |  |  |
Money market funds |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Cash equivalents | 77,299 | 172,590 |  |
U.S. Treasury securities |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Cash equivalents | 4,729 |  |  |
Quoted Prices in active markets (Level 1) |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Total assets measured at fair value | 77,299 | 172,590 |  |
Quoted Prices in active markets (Level 1) | Money market funds |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Cash equivalents | 77,299 | $ 172,590 |  |
Significant other observable inputs (Level 2) |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Total assets measured at fair value | 76,330 |  |  |
Significant other observable inputs (Level 2) | Corporate debt securities |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Marketable securities | 41,612 |  |  |
Significant other observable inputs (Level 2) | U.S. Treasury securities |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Marketable securities | 25,468 |  |  |
Significant other observable inputs (Level 2) | Government-sponsored securities |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Marketable securities | 4,521 |  |  |
Significant other observable inputs (Level 2) | U.S. Treasury securities |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Cash equivalents | $ 4,729 |  |  |

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