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v3.22.1

Long-Term Debt - Narrative (Details) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 05, 2022 USD ($) day | Feb. 16, 2018 USD ($) day $ / shares Rate | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Interest expense, debt |  |  | $ 2,017,000 | $ 1,929,000 |
Coupon interest expense |  |  | 1,617,000 | 1,617,000 |
Amortization of debt discount and debt issuance costs |  |  | 312,000 | $ 312,000 |
Long-term debt |  |  | 116,525,000 |  | $ 142,397,000
ADSs, conversion ratio | Rate |  | 9269.56% |  |  |
4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Debt instrument, face amount |  | $ 125,000 |  |  |
Option to purchase aggregate principal amount, term |  | 30 days |  |  |
Option to increase aggregate principal amount |  | $ 18,750,000 |  |  |
Proceeds from loans or conditional grants |  | 137,560,000 |  |  |
ADS, minimum amount of principal amount for exchange |  | $ 200 |  |  |
ADS, option price per share (in dollars per share) | $ / shares |  | $ 10.79 |  |  |
4.50% Exchangeable Senior Notes Due 2023 | Senior Notes |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Long-term debt |  |  | 117,375,000 |  |
4.50% Exchangeable Senior Notes Due October 2023 | Convertible Debt | Subsequent Event |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Debt instrument, exchange amount | $ 117,375,000 |  |  |  |
4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt | Subsequent Event |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 26,375,000 |  |  |  |
4.50% Exchangeable Senior Notes Due 2023 | Senior Notes |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Additional interest expense |  |  | $ 88,000 |  |
Debt Instrument, Redemption, Period One | 4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Number of business days |  | 5 days |  |  |
Consecutive business days |  | 5 days |  |  |
Percentage of product of the last reported sale price of the American Depositary Shares and the exchange rate on each such trading day |  | 98.00% |  |  |
Debt Instrument, Redemption, Period One | 4.50% Exchangeable Senior Notes Due October 2023 | Convertible Debt | Subsequent Event |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Number of business days | 5 days |  |  |  |
Consecutive business days | 5 days |  |  |  |
Percentage of product of the last reported sale price of the American Depositary Shares and the exchange rate on each such trading day | 98.00% |  |  |  |
Debt Instrument, Redemption, Period Two | 4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Threshold trading days | day |  | 95 |  |  |
Scheduled threshold trading days |  | 35 days |  |  |
Debt Instrument, Redemption, Period Two | 4.50% Exchangeable Senior Notes Due October 2023 | Convertible Debt | Subsequent Event |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Threshold trading days | day | 95 |  |  |  |
Scheduled threshold trading days | 35 days |  |  |  |
Debt Instrument, Redemption, Period Three | 4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Threshold trading days | day |  | 20 |  |  |
Consecutive trading days | day |  | 30 |  |  |
Threshold percentage of stock price trigger |  | 130.00% |  |  |
Debt Instrument, Redemption, Period Three | 4.50% Exchangeable Senior Notes Due October 2023 | Convertible Debt | Subsequent Event |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |
Threshold trading days | day | 20 |  |  |  |
Consecutive trading days | day | 30 |  |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |  |

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