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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2019 $ 699,135 $ 15 $ 2,402,945 $ (1,704,122) $ 297
Issuance of common stock from exercise of stock optionsand units   1 58,899    
Common stock issues in connection with merger agreement 44,280   44,280    
Issuance of common stock pursuant to employee stockpurchase plan     3,970    
Stock-based compensation     63,194    
Net loss (214,824)     (214,824)  
Other comprehensive (loss) income 212        
Ending balance at Sep. 30, 2020 654,867 16 2,573,288 (1,918,946) 509
Beginning balance at Jun. 30, 2020 663,013 15 2,495,804 (1,834,286) 1,480
Issuance of common stock from exercise of stock optionsand units   1 11,714    
Common stock issues in connection with merger agreement     44,280    
Stock-based compensation     21,490    
Net loss (84,660)     (84,660)  
Other comprehensive (loss) income (971)        
Ending balance at Sep. 30, 2020 654,867 16 2,573,288 (1,918,946) 509
Beginning balance at Dec. 31, 2020 627,009 16 2,612,663 (1,985,706) 36
Issuance of common stock from exercise of stock optionsand units     10,060    
Issuance of common stock pursuant to employee stockpurchase plan     3,737    
Stock-based compensation     50,962    
Net loss (124,776)     (124,776)  
Other comprehensive (loss) income (37)        
Ending balance at Sep. 30, 2021 566,955 16 2,677,422 (2,110,482) (1)
Beginning balance at Jun. 30, 2021 564,838 16 2,660,809 (2,096,025) 38
Issuance of common stock from exercise of stock optionsand units     1,066    
Stock-based compensation     15,547    
Net loss (14,457)     (14,457)  
Other comprehensive (loss) income (39)        
Ending balance at Sep. 30, 2021 $ 566,955 $ 16 $ 2,677,422 $ (2,110,482) $ (1)