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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 options and units     3,754    
Stock-based compensation     22,288    
Net loss (88,023)     (88,023)  
Other comprehensive (loss) income 1,228        
Ending balance at Mar. 31, 2020 638,382 15 2,428,987 (1,792,145) 1,525
Beginning balance at Dec. 31, 2020 627,009 16 2,612,663 (1,985,706) 36
Issuance of common stock from exercise of stock options and units     7,726    
Stock-based compensation     13,321    
Net loss (66,448)     (66,448)  
Other comprehensive (loss) income (2)        
Ending balance at Mar. 31, 2021 $ 581,606 $ 16 $ 2,633,710 $ (2,052,154) $ 34