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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock $0.001 Par
Additional Paid-in Capital
Other Accumulated Comprehensive Income
Accumulated Deficit
Balance at Dec. 31, 2017 $ 85,038 $ 16 $ 156,685 $ (9) $ (71,654)
Balance (in Shares) at Dec. 31, 2017   16,272,617      
Effect of adoption of ASU | ASU 2014-09 (ASC 606) 324       324
Sale of common stock, net of issuance costs 82,666 $ 9 82,657    
Sale of common stock, net of issuance costs, shares   9,179,500      
Exercise of options 103   103    
Exercise of options,shares   9,393      
Cancellation of restricted stock   (21,169)      
Equity-based compensation expense 3,445   3,445    
Unrealized gain (loss) on securities (38)     (38)  
Net loss (36,504)       (36,504)
Balance at Sep. 30, 2018 135,034 $ 25 242,890 (47) (107,834)
Balance (in Shares) at Sep. 30, 2018   25,440,341      
Balance at Jun. 30, 2018 144,620 $ 25 241,756 (75) (97,086)
Balance (in Shares) at Jun. 30, 2018   25,432,849      
Exercise of options 103   103    
Exercise of options,shares   9,393      
Cancellation of restricted stock   (1,901)      
Equity-based compensation expense 1,031   1,031    
Unrealized gain (loss) on securities 28     28  
Net loss (10,748)       (10,748)
Balance at Sep. 30, 2018 135,034 $ 25 242,890 (47) (107,834)
Balance (in Shares) at Sep. 30, 2018   25,440,341      
Balance at Dec. 31, 2018 124,098 $ 25 243,903 (65) (119,765)
Balance (in Shares) at Dec. 31, 2018   25,401,479      
Issuance of restricted stock   $ 1 (1)    
Issuance of restricted stock, shares   585,600      
Sale of common stock, net of issuance costs 56,997 $ 7 56,990    
Sale of common stock, net of issuance costs, shares   6,340,771      
Proceeds from pre-funded common stock warrants, net of issuance costs 22,874   22,874    
Cancellation of restricted stock   (37,036)      
Equity-based compensation expense 3,094   3,094    
Unrealized gain (loss) on securities 179     179  
Net loss (38,575)       (38,575)
Balance at Sep. 30, 2019 168,667 $ 33 326,860 114 (158,340)
Balance (in Shares) at Sep. 30, 2019   32,290,814      
Balance at Jun. 30, 2019 180,823 $ 32 325,778 68 (145,055)
Balance (in Shares) at Jun. 30, 2019   31,719,719      
Issuance of restricted stock   $ 1 (1)    
Issuance of restricted stock, shares   585,600      
Cancellation of restricted stock   (14,505)      
Adjustment to accrued common stock issuance costs 14   14    
Equity-based compensation expense 1,069   1,069    
Unrealized gain (loss) on securities 46     46  
Net loss (13,285)       (13,285)
Balance at Sep. 30, 2019 $ 168,667 $ 33 $ 326,860 $ 114 $ (158,340)
Balance (in Shares) at Sep. 30, 2019   32,290,814