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v3.22.2.2

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Aug. 31, 2022 | Dec. 31, 2021 | Feb. 14, 2020 | Feb. 05, 2020
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | $ 60,715 | $ 60,715 |  |  | $ 50,708 |  |
Marketable securities | 45,760 | 45,760 |  |  | 106,513 |  |
Commission percentage |  |  |  |  |  |  | 3.00%
Proceeds from sale of shares |  | 10,532 | $ 0 |  |  |  |
4.50% Exchangeable Senior Notes Due 2023 | Senior Notes |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Long-term debt | $ 26,375 | $ 26,375 |  |  | $ 143,750 |  |
Debt instrument, interest rate (as a percent) | 4.50% | 4.50% |  |  | 4.50% |  |
4.50 Percent Exchangeable Senior Notes Due October 2023 | Senior Notes |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Long-term debt | $ 117,375 | $ 117,375 |  |  | $ 0 |  |
Debt instrument, interest rate (as a percent) | 4.50% | 4.50% |  |  |  |  |
At-The-Market Offering Program |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Maximum aggregate offering price of ADS under shelf registration | $ 135,000 | $ 135,000 |  |  |  |  |
Open Market Sales Agreement, 2020 Prospectus |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Maximum aggregate offering price of ADS under shelf registration |  |  |  |  |  | $ 50,000 |
Remaining value of ADSs available for sale | $ 39,142 | 39,142 |  |  |  |  |
Open Market Sales Agreement, 2020 Prospectus | Common Stock |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Shares sold (in shares) | 1,768 |  |  |  |  |  |
Proceeds from sale of shares | $ 10,532 |  |  |  |  |  |
Open Market Sales Agreement, 2022 Prospectus |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Maximum aggregate offering price of ADS under shelf registration |  |  |  | $ 100,000 |  |  |
Remaining value of ADSs available for sale | $ 100,000 | $ 100,000 |  |  |  |  |

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