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Organization and Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity |  | $ 72,979 | $ 64,277 | $ 54,202 | $ (9,740)
Convertible senior notes, current |  | 298,661 | 0 |  |
Subsequent Event |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accounting Standards Update [Extensible List] | Accounting Standards Update 2020-06 [Member] |  |  |  |
Accumulated Deficit |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity |  | (452,430) | (414,700) | (366,302) | (307,027)
Additional Paid-in-Capital |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity |  | $ 525,646 | $ 478,698 | $ 420,170 | 297,145
Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity |  |  |  |  | (11,796)
Adjustment | Subsequent Event |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Convertible senior notes, current | $ 40,000 |  |  |  |
Adjustment | Accumulated Deficit |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity |  |  |  |  | $ (11,796)
Adjustment | Accumulated Deficit | Subsequent Event |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity | 18,000 |  |  |  |
Adjustment | Additional Paid-in-Capital | Subsequent Event |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity | $ (58,000) |  |  |  |

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