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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ (DEFICIT) EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018   22,466,000      
Beginning balance at Dec. 31, 2018 $ 51,975 $ 7 $ 371,463 $ 1,992 $ (321,487)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (in shares)   215,000      
Exercise of common stock options $ 2,850   $ 2,850    
Stock Issued During Period, Shares, Warrants Exercised In Period 17,659,000 821,000 17,659,000    
Stock-based compensation     $ 12,292    
Settlement of restricted stock (in shares)   0      
Vesting of common stock warrants $ 12,292        
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   164,000      
Stock Issued During Period, Value, Restricted Stock Award, Gross   $ 0 0    
Other comprehensive income 642     642  
Ending balance (in shares) at Sep. 30, 2019   25,664,000      
Ending balance at Sep. 30, 2019 127,321 $ 8 466,737 2,634 (342,058)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued During Period, Value, Employee Stock Purchase Plan 1,165 $ 94 1,165    
Net Income (Loss) Attributable to Parent (20,571)       (20,571)
Beginning balance (in shares) at Dec. 31, 2018   22,466,000      
Beginning balance at Dec. 31, 2018 51,975 $ 7 371,463 1,992 (321,487)
Ending balance (in shares) at Dec. 31, 2019   26,547,000      
Ending balance at Dec. 31, 2019 143,267 $ 8 480,578 1,312 (338,631)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued During Period, Value, Employee Stock Purchase Plan 1,312 $ 28 1,312    
Beginning balance (in shares) at Jun. 30, 2019   22,828,000      
Beginning balance at Jun. 30, 2019 46,538 $ 7 378,773 2,069 (334,311)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (in shares)   104,000      
Exercise of common stock options $ 1,502   $ 1,502    
Stock Issued During Period, Shares, Warrants Exercised In Period 17,659,000 821,000 17,659,000    
Stock-based compensation     $ 7,495    
Settlement of restricted stock (in shares)   0      
Vesting of common stock warrants $ 7,495        
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   7,000      
Stock Issued During Period, Value, Restricted Stock Award, Gross   $ 0 0    
Other comprehensive income 565     565  
Ending balance (in shares) at Sep. 30, 2019   25,664,000      
Ending balance at Sep. 30, 2019 127,321 $ 8 466,737 2,634 (342,058)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) Attributable to Parent (7,747)       (7,747)
Beginning balance (in shares) at Dec. 31, 2019   26,547,000      
Beginning balance at Dec. 31, 2019 $ 143,267 $ 8 480,578 1,312 (338,631)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (in shares) 324,000 324,000      
Exercise of common stock options $ 6,371   $ 6,371    
Stock Issued During Period, Shares, Warrants Exercised In Period 0 9,000 0    
Stock-based compensation $ 22,636   $ 22,636    
Settlement of restricted stock (in shares)   518,000      
Other comprehensive income 451     451  
Ending balance (in shares) at Sep. 30, 2020   27,426,000      
Ending balance at Sep. 30, 2020 150,358 $ 8 535,863 1,763 (387,276)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 51,416        
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature (26,450)        
Net Income (Loss) Attributable to Parent (48,645)       (48,645)
Beginning balance (in shares) at Jun. 30, 2020   27,275,000      
Beginning balance at Jun. 30, 2020 130,465 $ 8 499,663 2,714 (371,920)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (in shares)   49,000      
Exercise of common stock options 945   945    
Stock-based compensation 10,289   10,289    
Settlement of restricted stock (in shares)   102,000      
Other comprehensive income (951)     (951)  
Ending balance (in shares) at Sep. 30, 2020   27,426,000      
Ending balance at Sep. 30, 2020 150,358 $ 8 535,863 $ 1,763 (387,276)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued During Period, Value, Employee Stock Purchase Plan 0 $ 0 $ 0    
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 51,416        
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature (26,450)        
Net Income (Loss) Attributable to Parent (15,356)       $ (15,356)
Common Stock, Value, Outstanding $ 61,308        
Common stock, shares issued (in shares) 1,904,000