XML 43 R33.htm IDEA: XBRL DOCUMENT 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%