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v3.22.2.2

Summary of Significant Accounting Policies - Liquidity - Additional Information (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Jul. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Income (loss) from continuing operations, net of tax, attributable to parent | $ (57,601,000) |  |  |
Net cash used in operating activities | (49,649,000) | $ (41,182,000) |  |
Accumulated deficit | 1,846,391,000 |  | $ 1,915,556,000 |
Cash, cash equivalents, restricted cash, and short-term investments | 153,770,000 |  |  |
3.5% Convertible Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount | $ 82,440,000 |  |  | $ 200,000,000

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