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Unaudited Consolidated Statements of Series A Preferred Shares and Shareholders' Equity - USD ($)
$ in Thousands
Total
At-The-Market Equity Program [Member]
Series A Preferred Shares [Member]
Ordinary Shares [Member]
Ordinary Shares [Member]
At-The-Market Equity Program [Member]
Additional Paid-In-Capital [Member]
Accumulated Other Comprehensive Income [Member]
Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2019 $ 63,732     $ 539,547   $ 57,277 $ 267 $ (533,359)
Beginning balance, shares at Dec. 31, 2019       34,340,690        
Temporary equity, Beginning balance at Dec. 31, 2019     $ 7,874          
Temporary equity, Beginning balance, shares at Dec. 31, 2019     3,901,348          
Issuance of ordinary shares pursuant to the at-the-market equity program, net   $ 604     $ 604      
Issuance of ordinary shares, shares         59,690      
Share-based compensation 3,999         3,999    
Vesting of RSUs, shares       198,202        
Option exercises 10     $ 10        
Option exercises, shares       3,000        
Other comprehensive income (loss) 6           6  
Net loss (47,493)             (47,493)
Ending balance at Mar. 31, 2020 20,858     $ 540,161   61,276 273 (580,852)
Ending balance, shares at Mar. 31, 2020       34,601,582        
Temporary equity, Ending balance at Mar. 31, 2020     $ 7,874          
Temporary equity, Ending balance, shares at Mar. 31, 2020     3,901,348          
Beginning balance at Dec. 31, 2020 82,778     $ 694,085   71,573 389 (683,269)
Beginning balance, shares at Dec. 31, 2020       48,778,678        
Temporary equity, Beginning balance at Dec. 31, 2020 $ 7,874   $ 7,874          
Temporary equity, Beginning balance, shares at Dec. 31, 2020 3,901,348   3,901,348          
Issuance of ordinary shares pursuant to the at-the-market equity program, net   $ 8,028     $ 8,028      
Issuance of ordinary shares, shares   844,796     844,796      
Share-based compensation $ 4,063         4,063    
Vesting of RSUs, shares       155,184        
Option exercises 200     $ 200        
Option exercises, shares       31,957        
Issuance of ordinary shares under the ESPP 336     $ 336        
Issuance of ordinary shares under ESPP, shares       44,036        
Other comprehensive income (loss) (120)           (120)  
Net loss (42,464)             (42,464)
Ending balance at Mar. 31, 2021 52,821     $ 702,649   $ 75,636 $ 269 $ (725,733)
Ending balance, shares at Mar. 31, 2021       49,854,651        
Temporary equity, Ending balance at Mar. 31, 2021 $ 7,874   $ 7,874          
Temporary equity, Ending balance, shares at Mar. 31, 2021 3,901,348   3,901,348