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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Ordinary shares
Preferred shares
Additional paid-in capital
Additional paid-in capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated deficit
Accumulated deficit
Cumulative Effect, Period of Adoption, Adjustment
Accumulated other comprehensive loss
Treasury Shares
Beginning balance (in shares) at Dec. 31, 2018     42,720 0           5,407
Beginning balance at Dec. 31, 2018 $ 2,780   $ 427 $ 0 $ 433,756   $ (357,989)   $ (23,416) $ (49,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net (loss) income (33,226)           (33,226)      
Other comprehensive income (loss) 610               610  
Vesting of restricted shares (in shares)     153              
Vesting of restricted shares 0   $ 2   (2)          
Employee share purchase plan share issuance (in shares)     54              
Employee share purchase plan share issuance 118       118          
Share-based compensation expense 519       519          
Ending balance (in shares) at Dec. 31, 2019     42,927 0           5,407
Ending balance at Dec. 31, 2019 $ (29,199)   $ 429 $ 0 434,391   (391,215)   (22,806) $ (49,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2020-06 [Member]                  
Net (loss) income $ 7,028           7,028      
Other comprehensive income (loss) 1,755               1,755  
Exercise of stock options (in shares)     403              
Exercise of stock options 2,045   $ 4   2,041          
February 2020 private placement (in shares)     8,680 488            
February 2020 private placement 60,570   $ 87 $ 5 60,478          
May 2020 public offering (in shares)     11,630              
May 2020 public offering 116,924   $ 116   116,808          
Vesting of restricted shares (in shares)     114              
Vesting of restricted shares 0   $ 1   (1)          
Employee share purchase plan share issuance (in shares)     49              
Employee share purchase plan share issuance 144       144          
Share-based compensation expense 2,999       2,999          
Retirement of treasury shares (in shares)     (5,407)             (5,407)
Retirement of treasury shares 0   $ (54)   (49,944)         $ (49,998)
Ending balance (in shares) at Dec. 31, 2020     58,396 488           0
Ending balance at Dec. 31, 2020 162,266 $ (12,939) $ 583 $ 5 566,916 $ (26,699) (384,187) $ 13,760 (21,051) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net (loss) income (77,329)           (77,329)      
Other comprehensive income (loss) $ (2,889)               (2,889)  
Exercise of stock options (in shares) 48   48              
Exercise of stock options $ 169   $ 1   168          
Vesting of restricted shares (in shares)     159              
Vesting of restricted shares 0   $ 2   (2)          
Employee share purchase plan share issuance (in shares)     17              
Employee share purchase plan share issuance 94       94          
Share-based compensation expense 8,872       8,872          
Ending balance (in shares) at Dec. 31, 2021     58,620 488           0
Ending balance at Dec. 31, 2021 $ 78,244   $ 586 $ 5 $ 549,349   $ (447,756)   $ (23,940) $ 0