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Long-Term Debt - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 26, 2023 USD ($) $ / shares shares | Apr. 04, 2023 USD ($) | Apr. 05, 2022 USD ($) | Feb. 16, 2018 USD ($) $ / shares | Oct. 31, 2023 USD ($) shares | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) day $ / shares | Sep. 30, 2022 USD ($) | Apr. 03, 2023 $ / shares | Mar. 31, 2023 USD ($) | Feb. 01, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares | Nov. 04, 2022 USD ($)
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | $ 1,978 | $ 3,564 |  | $ 7,532 | $ 9,087 |  |  |  |  |
Amortization of debt issuance costs and debt discount |  |  |  |  |  |  |  |  | 2,796 | 4,147 |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 30,000 | 0 |  |  |  |  |
Payments of debt issuance costs |  |  |  |  |  |  |  |  | 4,357 | 4,803 |  |  |  |  |
Change in fair value of October 2023 Notes conversion feature |  |  | $ 5,508 |  |  |  |  | $ 5,508 |  |  |  |  |  |  |
Increase in fair value of unseparated embedded conversion feature |  |  | 5,508 |  |  |  |  |  |  |  |  |  |  |  |
ADSs, conversion ratio | 0.1161846 |  |  | 92.6956 |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of conversion | $ 1,470 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash settlement of notes |  |  |  |  |  |  |  |  | 17,500 | 0 |  |  |  |  |
Number of ADSs issued upon settlement/ conversion (in shares) | shares | 12,347 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 13,129 |  |  |  | $ 0 | 0 |  | $ 13,129 | 0 |  |  |  |  |
Ordinary shares, nominal value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01 |  |  | $ 0.01 |
Subsequent Event | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ADSs issued upon settlement/ conversion (in shares) | shares |  |  |  |  | 408 |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | $ 574 | 3,564 |  | $ 6,128 | 9,087 |  |  |  |  |
Coupon interest expense |  |  |  |  |  | 238 | 1,646 |  | 3,332 | 4,852 |  |  |  |  |
Amortization of debt issuance costs and debt discount |  |  |  |  |  | $ 336 | $ 1,918 |  | $ 2,796 | $ 4,147 |  |  |  |  |
4.50% Exchangeable Senior Notes Due 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.50% |  |  | 4.50% |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  | $ 17,500 | $ 17,500 |
4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 26,375 | $ 125,000 |  |  |  |  |  |  |  |  |  |  |
Option to purchase aggregate principal amount, term |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |
Option to increase aggregate principal amount |  |  |  | $ 18,750 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  | $ 137,560 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, exchange amount |  |  | 117,375 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,875
4.50% Exchangeable Senior Notes Due October 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |
4.50% Exchangeable Senior Notes Due October 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.50% |  |  | 4.50% |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 21,187 |  |  | $ 21,187 |  |  | $ 117,375 |  | $ 117,375 |
Payments of debt issuance costs |  |  | 4,804 |  |  |  |  |  |  |  |  |  |  |  |
Debt exchanged |  | $ 96,188 |  |  |  |  |  |  |  |  |  |  |  |  |
4.50% Exchangeable Senior Notes Due October 2023 | Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash settlement of notes |  |  |  |  | $ 21,641 |  |  |  |  |  |  |  |  |  |
4.50% Exchangeable Senior Notes Due October 2023 | Senior Notes | Third Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  | $ 5,450 |  |  |  |  |  |  |  |  |  |  |  |
4.50% Exchangeable Senior Notes Due October 2023 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ADS, option price per share (in dollars per share) | $ / shares |  |  |  | $ 10.79 |  |  |  |  |  |  |  |  |  |  |
ADS premium percentage |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |
ADS shares purchase (in dollars per share) | $ / shares |  |  |  | $ 8.99 |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |
Threshold trading days | day |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |
Consecutive trading days | day |  |  |  |  |  |  |  |  | 30 |  |  |  |  |  |
April 2027 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |
April 2027 Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 106,268 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt exchanged | $ 106,268 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of conversion |  | $ 106,268 |  |  |  |  |  |  |  |  |  |  |  |  |

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