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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017   60,599,877      
Beginning balance at Dec. 31, 2017 $ 45,524 $ 6 $ 141,268 $ 439 $ (96,189)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (9,553)       (9,553)
Issuance of common stock to directors (in shares)   2,935      
Exercise of stock options (in shares)   607,349      
Exercise of stock options 982   982    
Stock-based compensation expense 2,240   2,240    
Other comprehensive income (loss) (565)     (565)  
Ending balance (in shares) at Mar. 31, 2018   61,210,161      
Ending balance at Mar. 31, 2018 38,628 $ 6 144,490 (126) (105,742)
Beginning balance (in shares) at Dec. 31, 2017   60,599,877      
Beginning balance at Dec. 31, 2017 45,524 $ 6 141,268 439 (96,189)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (35,548)        
Ending balance (in shares) at Sep. 30, 2018   63,588,316      
Ending balance at Sep. 30, 2018 81,816 $ 6 212,971 576 (131,737)
Beginning balance (in shares) at Mar. 31, 2018   61,210,161      
Beginning balance at Mar. 31, 2018 38,628 $ 6 144,490 (126) (105,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (10,967)       (10,967)
Issuance of common stock to directors (in shares)   3,670      
Exercise of stock options (in shares)   399,049      
Exercise of stock options 1,090   1,090    
Stock-based compensation expense 2,206   2,206    
Other comprehensive income (loss) 1,102     1,102  
Ending balance (in shares) at Jun. 30, 2018   61,612,880      
Ending balance at Jun. 30, 2018 32,059 $ 6 147,786 976 (116,709)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (15,028)       (15,028)
Issuance of common stock from public offering, net of issuance costs (in shares)   1,675,000      
Issuance of common stock from public offering, net of issuance costs 57,829   57,829    
Issuance of common stock to directors (in shares)   2,555      
Vesting of restricted stock units (in shares)   6,300      
Exercise of stock options (in shares)   291,581      
Exercise of stock options 555   555    
Stock-based compensation expense 6,801   6,801    
Other comprehensive income (loss) (400)     (400)  
Ending balance (in shares) at Sep. 30, 2018   63,588,316      
Ending balance at Sep. 30, 2018 81,816 $ 6 212,971 576 (131,737)
Beginning balance (in shares) at Dec. 31, 2018   63,916,437      
Beginning balance at Dec. 31, 2018 73,192 $ 6 218,284 542 (145,640)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (17,537)       (17,537)
Issuance of common stock to directors (in shares)   3,461      
Vesting of restricted stock units (in shares)   278,680      
Exercise of stock options (in shares)   482,444      
Exercise of stock options 1,073   1,073    
Stock-based compensation expense 7,225   7,225    
Other comprehensive income (loss) 340     340  
Ending balance (in shares) at Mar. 31, 2019   64,681,022      
Ending balance at Mar. 31, 2019 64,293 $ 6 226,582 882 (163,177)
Beginning balance (in shares) at Dec. 31, 2018   63,916,437      
Beginning balance at Dec. 31, 2018 73,192 $ 6 218,284 542 (145,640)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ (39,358)        
Exercise of stock options (in shares) 1,017,391        
Ending balance (in shares) at Sep. 30, 2019   67,146,998      
Ending balance at Sep. 30, 2019 $ 152,808 $ 6 336,694 1,106 (184,998)
Beginning balance (in shares) at Mar. 31, 2019   64,681,022      
Beginning balance at Mar. 31, 2019 64,293 $ 6 226,582 882 (163,177)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (9,394)       (9,394)
Issuance of common stock to directors (in shares)   2,684      
Vesting of restricted stock units (in shares)   6,010      
Exercise of stock options (in shares)   147,852      
Exercise of stock options 914   914    
Stock-based compensation expense 2,689   2,689    
Other comprehensive income (loss) (730)     (730)  
Ending balance (in shares) at Jun. 30, 2019   64,837,568      
Ending balance at Jun. 30, 2019 57,772 $ 6 230,185 152 (172,571)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (12,427)       (12,427)
Issuance of common stock from public offering, net of issuance costs (in shares)   1,825,000      
Issuance of common stock from public offering, net of issuance costs 101,303   101,303    
Issuance of common stock to directors (in shares)   2,563      
Vesting of restricted stock units (in shares)   94,772      
Exercise of stock options (in shares)   387,095      
Exercise of stock options 2,065   2,065    
Stock-based compensation expense 3,141   3,141    
Other comprehensive income (loss) 954     954  
Ending balance (in shares) at Sep. 30, 2019   67,146,998      
Ending balance at Sep. 30, 2019 $ 152,808 $ 6 $ 336,694 $ 1,106 $ (184,998)