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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2017   36,859,077      
Beginning balance at Dec. 31, 2017 $ 299,238 $ 369 $ 611,270 $ (312,340) $ (61)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Share-based compensation 3,386   3,386    
Stock plan related activity 629 $ 1 628    
Stock plan related activity (in shares)   165,546      
Unrealized gain (loss) on investments 38       38
Net loss (49,536)     (49,536)  
Ending balance (in shares) at Mar. 31, 2018   37,024,623      
Ending balance at Mar. 31, 2018 247,276 $ 370 615,284 (368,355) (23)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Share-based compensation 4,209   4,209    
Issuance of common stock, net of offering costs (in shares)   5,175,000      
Issuance of common stock, net of offering costs 103,259 $ 52 103,207    
Stock plan related activity 496   496    
Stock plan related activity (in shares)   29,388      
Unrealized gain (loss) on investments 40       40
Net loss (43,244)     (43,244)  
Ending balance (in shares) at Jun. 30, 2018   42,229,011      
Ending balance at Jun. 30, 2018 312,036 $ 422 723,196 (411,599) 17
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Share-based compensation 4,522   4,522    
Stock plan related activity 131   131    
Stock plan related activity (in shares)   19,064      
Unrealized gain (loss) on investments (17)       (17)
Net loss (34,029)     (34,029)  
Ending balance (in shares) at Sep. 30, 2018   42,248,075      
Ending balance at Sep. 30, 2018 282,643 $ 422 727,849 (445,628) 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]          
Share-based compensation 3,750   3,750    
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 plan related activity 347 $ 1 346    
Stock plan related activity (in shares)   126,707      
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]          
Stock plan related activity (in shares) 2,384,770        
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]          
Share-based compensation 4,933   4,933    
Stock plan related activity 634 $ 1 633    
Stock plan related activity (in shares)   88,443      
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]          
Share-based compensation 5,352   5,352    
Stock plan related activity 37   37    
Stock plan related activity (in shares)   20,833      
Unrealized gain (loss) on investments (11)       (11)
Net loss (44,631)     (44,631) 0
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