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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ (DEFICIT) EQUITY (UNAUDITED) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Stock Issued During Period, Shares, Conversion of Convertible Securities   10,643      
Stock Issued During Period, Value, Conversion of Convertible Securities   $ 6 $ 1,736    
Adjustments to Additional Paid in Capital, Preferred Stock Warrant Conversion, Common Stock Warrant $ 196,594   196,588    
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants   $ 0      
Beginning balance (in shares) at Dec. 31, 2017   3,439      
Beginning balance at Dec. 31, 2017 (208,686) $ 0 58,693 $ 1,066 $ (268,445)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (in shares)   329      
Exercise of common stock options $ 1,799   $ 1,799    
Stock Issued During Period, Shares, Warrants Exercised In Period 0 1,142 0    
Stock-based compensation     $ 16,968    
Settlement of restricted stock (in shares)   0      
Vesting of common stock warrants $ 16,968        
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   37      
Stock Issued During Period, Value, New Issues 66,101 $ 1 66,100    
Stock Issued During Period, Shares, New Issues   5,821      
Stock Issued During Period, Value, Restricted Stock Award, Gross   $ 0 0    
Accretion of redeemable convertible preferred stock to redemption value     (157)    
Preferred Stock, Accretion of Redemption Discount (157)     0  
Other comprehensive income 574     574  
Net loss (41,476)       (41,476)
Ending balance (in shares) at Sep. 30, 2018   21,411      
Ending balance at Sep. 30, 2018 51,227 $ 7 359,501 1,640 (309,921)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature 17,774        
Beginning balance (in shares) at Jun. 30, 2018   20,316      
Beginning balance at Jun. 30, 2018 36,766 $ 7 336,874 1,438 (301,553)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of common stock options (in shares)   265      
Exercise of common stock options 1,655   1,655    
Stock-based compensation     0    
Settlement of restricted stock (in shares)   37      
Vesting of common stock warrants 15,255 $ 793 15,255    
Stock Issued During Period, Value, New Issues 5,717 $ 0 5,717    
Other comprehensive income 202     202  
Net loss (8,368)       (8,368)
Ending balance (in shares) at Sep. 30, 2018   21,411      
Ending balance at Sep. 30, 2018 51,227 $ 7 359,501 1,640 (309,921)
Beginning balance (in shares) at Dec. 31, 2018   22,466      
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) 215 215      
Exercise of common stock options $ 2,850   $ 2,850    
Stock Issued During Period, Shares, Warrants Exercised In Period 17,659 821 17,659    
Stock-based compensation $ 12,292   $ 12,292    
Settlement of restricted stock (in shares)   164      
Stock Issued During Period, Value, New Issues 61,309 $ 1 61,308    
Stock Issued During Period, Shares, New Issues   1,904      
Other comprehensive income 642     642  
Net loss (20,571)       (20,571)
Ending balance (in shares) at Sep. 30, 2019   25,664      
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)    
Beginning balance (in shares) at Jun. 30, 2019   22,828      
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      
Exercise of common stock options $ 1,502   $ 1,502    
Stock Issued During Period, Shares, Warrants Exercised In Period 17,659 821 17,659    
Stock-based compensation $ 7,495   $ 7,495    
Settlement of restricted stock (in shares)   7      
Stock Issued During Period, Value, New Issues 61,309 $ 1 61,308    
Stock Issued During Period, Shares, New Issues   1,904      
Other comprehensive income 565     565  
Net loss (7,747)       (7,747)
Ending balance (in shares) at Sep. 30, 2019   25,664      
Ending balance at Sep. 30, 2019 $ 127,321 $ 8 $ 466,737 $ 2,634 $ (342,058)