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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Revision of Prior Period, Accounting Standards Update, Adjustment
Common Stock
Additional Paid In Capital
Accumulated Other Comprehensive Gain
Noncontrolling Interest
Accumulated Deficit
Accumulated Deficit
Revision of Prior Period, Accounting Standards Update, Adjustment
Beginning Balance at Dec. 31, 2019 $ 571,039 $ 93 $ 12 $ 935,834 $ 671   $ (365,478) $ 93
Beginning Balance, Shares at Dec. 31, 2019     125,238,142          
Accounting Standards Update Extensible List us-gaap:AccountingStandardsUpdate201602Member              
Issuance of common stock for cash upon exercise of stock options $ 11,215     11,215        
Issuance of common stock for cash upon exercise of stock options, Shares     2,991,200          
Vesting of restricted stock units     4,500          
Common stock option and restricted stock unit share-based compensation 11,048     11,048        
Other comprehensive income (loss) 1,482       1,482      
Net loss (64,938)           (64,938)  
Ending Balance at Jun. 30, 2020 529,939   $ 12 958,097 2,153   (430,323)  
Ending Balance, Shares at Jun. 30, 2020     128,233,842          
Beginning Balance at Mar. 31, 2020 551,563   $ 12 945,026 3,313   (396,788)  
Beginning Balance, Shares at Mar. 31, 2020     126,621,829          
Issuance of common stock for cash upon exercise of stock options 6,698     6,698        
Issuance of common stock for cash upon exercise of stock options, Shares     1,609,763          
Vesting of restricted stock units     2,250          
Common stock option and restricted stock unit share-based compensation 6,373     6,373        
Other comprehensive income (loss) (1,160)       (1,160)      
Net loss (33,535)           (33,535)  
Ending Balance at Jun. 30, 2020 529,939   $ 12 958,097 2,153   (430,323)  
Ending Balance, Shares at Jun. 30, 2020     128,233,842          
Beginning Balance at Dec. 31, 2020 743,266   $ 14 1,253,971 893   (511,612)  
Beginning Balance, Shares at Dec. 31, 2020     137,646,896          
Issuance of common stock upon exercise of common stock warrants, Shares     54,162          
Issuance of common stock for cash upon exercise of stock options $ 20,502     20,502        
Issuance of common stock for cash upon exercise of stock options, Shares 2,950,197   2,950,197          
Vesting of restricted stock units     12,500          
Common stock option and restricted stock unit share-based compensation $ 19,733     19,733        
Capital contributions for Spin Technologies, Inc. 429     300   $ 129    
Other comprehensive income (loss) (677)       (677)      
Net loss (89,943)           (89,943)  
Ending Balance at Jun. 30, 2021 693,310   $ 14 1,294,506 216 129 (601,555)  
Ending Balance, Shares at Jun. 30, 2021     140,663,755          
Beginning Balance at Mar. 31, 2021 725,717   $ 14 1,277,197 631 129 (552,254)  
Beginning Balance, Shares at Mar. 31, 2021     139,884,698          
Issuance of common stock for cash upon exercise of stock options 6,060     6,060        
Issuance of common stock for cash upon exercise of stock options, Shares     766,557          
Vesting of restricted stock units     12,500          
Common stock option and restricted stock unit share-based compensation 11,249     11,249        
Other comprehensive income (loss) (415)       (415)      
Net loss (49,301)           (49,301)  
Ending Balance at Jun. 30, 2021 $ 693,310   $ 14 $ 1,294,506 $ 216 $ 129 $ (601,555)  
Ending Balance, Shares at Jun. 30, 2021     140,663,755