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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2018   42,353,301        
Beginning balance at Dec. 31, 2018 $ 242,877 $ 424   $ 732,727 $ (490,271) $ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock, net of offering costs (in shares)   6,325,000        
Issuance of common stock, net of offering costs 118,657 $ 63   118,594    
Stock-based compensation 3,750     3,750    
Stock plan related activity (in shares)   126,707        
Stock plan related activity 347 $ 1   346    
Unrealized gain (loss) on investments 3         3
Net loss (45,017)       (45,017)  
Ending balance (in shares) at Mar. 31, 2019   48,805,008        
Ending balance at Mar. 31, 2019 320,617 $ 488   855,417 (535,288) 0
Beginning balance (in shares) at Dec. 31, 2018   42,353,301        
Beginning balance at Dec. 31, 2018 242,877 $ 424   732,727 (490,271) (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (121,415)          
Ending balance (in shares) at Sep. 30, 2019   48,914,284        
Ending balance at Sep. 30, 2019 255,198 $ 489   866,372 (611,686) 23
Beginning balance (in shares) at Mar. 31, 2019   48,805,008        
Beginning balance at Mar. 31, 2019 320,617 $ 488   855,417 (535,288) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 4,933     4,933    
Stock plan related activity (in shares)   88,443        
Stock plan related activity 634 $ 1   633    
Unrealized gain (loss) on investments 34         34
Net loss (31,767)       (31,767)  
Ending balance (in shares) at Jun. 30, 2019   48,893,451        
Ending balance at Jun. 30, 2019 294,451 $ 489   860,983 (567,055) 34
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 5,352     5,352    
Stock plan related activity (in shares)   20,833        
Stock plan related activity 37     37    
Unrealized gain (loss) on investments (11)         (11)
Net loss (44,631)       (44,631)  
Ending balance (in shares) at Sep. 30, 2019   48,914,284        
Ending balance at Sep. 30, 2019 255,198 $ 489   866,372 (611,686) 23
Beginning balance (in shares) at Dec. 31, 2019   48,958,763 0      
Beginning balance at Dec. 31, 2019 230,628 $ 490 $ 0 872,204 (642,082) 16
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation 4,451     4,451    
Stock plan related activity (in shares)   172,387        
Stock plan related activity 162 $ 2   160    
Unrealized gain (loss) on investments 56         56
Net loss (44,724)       (44,724)  
Ending balance (in shares) at Mar. 31, 2020   49,131,150        
Ending balance at Mar. 31, 2020 190,573 $ 492   876,815 (686,806) 72
Beginning balance (in shares) at Dec. 31, 2019   48,958,763 0      
Beginning balance at Dec. 31, 2019 $ 230,628 $ 490 $ 0 872,204 (642,082) 16
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock plan related activity (in shares) 1,816,277          
Net loss $ (127,652)          
Ending balance (in shares) at Sep. 30, 2020   56,174,932        
Ending balance at Sep. 30, 2020 291,585 $ 562   1,060,755 (769,734) 2
Beginning balance (in shares) at Mar. 31, 2020   49,131,150        
Beginning balance at Mar. 31, 2020 190,573 $ 492   876,815 (686,806) 72
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock, net of offering costs (in shares)   4,060,482        
Issuance of common stock, net of offering costs 96,512 $ 40   96,472    
Stock-based compensation 5,136     5,136    
Stock plan related activity (in shares)   173,371        
Stock plan related activity 2,503 $ 2   2,501    
Unrealized gain (loss) on investments (55)         (55)
Net loss (46,885)       (46,885)  
Ending balance (in shares) at Jun. 30, 2020   53,365,003        
Ending balance at Jun. 30, 2020 247,784 $ 534   980,924 (733,691) 17
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock, net of offering costs (in shares)   2,552,333        
Issuance of common stock, net of offering costs 73,981 $ 25   73,956    
Stock-based compensation 5,796     5,796    
Stock plan related activity (in shares)   257,596 74,632      
Stock plan related activity 82 $ 3 $ (2,012) 2,091    
Retirement of treasury stock (in shares)     (74,632)      
Retirement of treasury stock 0   $ 2,012 (2,012)    
Unrealized gain (loss) on investments (15)         (15)
Net loss (36,043)       (36,043)  
Ending balance (in shares) at Sep. 30, 2020   56,174,932        
Ending balance at Sep. 30, 2020 $ 291,585 $ 562   $ 1,060,755 $ (769,734) $ 2