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Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital
Retained Earnings
AOCI Attributable to Parent
Balance at Dec. 31, 2016 $ 8,043   $ 68,327 $ (60,277) $ (7)
Balance (in shares) at Dec. 31, 2016   20,823,873      
Employee stock-based compensation 1,073   1,073    
Employee stock-based compensation (in shares)   (10,655)      
Issuance of common stock under employee stock plans 20   20    
Issuance of common stock under employee stock plans (in shares)   33,012      
Sale of common stock, net of issuance costs 9,580   9,580    
Sale of common stock, net of issuance costs (in shares)   7,652,617      
Unrealized gain (loss) on investments 3       3
Net loss (16,493)     (16,493)  
Balance at Sep. 30, 2017 2,226   79,000 (76,770) (4)
Balance (in shares) at Sep. 30, 2017   28,498,847      
Balance at Jun. 30, 2017 6,588   77,265 (70,671) (6)
Balance (in shares) at Jun. 30, 2017   27,697,284      
Employee stock-based compensation 344   344    
Employee stock-based compensation (in shares)   (219)      
Issuance of common stock under employee stock plans (in shares)   500      
Sale of common stock, net of issuance costs 1,391   1,391    
Sale of common stock, net of issuance costs (in shares)   801,282      
Unrealized gain (loss) on investments 2       2
Net loss (6,099)     (6,099)  
Balance at Sep. 30, 2017 2,226   79,000 (76,770) (4)
Balance (in shares) at Sep. 30, 2017   28,498,847      
Balance at Dec. 31, 2017 13,464   94,339 (80,855) (20)
Balance (in shares) at Dec. 31, 2017   35,817,104      
Employee stock-based compensation 1,890   1,890    
Employee stock-based compensation (in shares)   (22,546)      
Issuance of common stock under employee stock plans 470   470    
Issuance of common stock under employee stock plans (in shares)   257,289      
Issuance of common stock from warrant exercises 7,167   7,167    
Issuance of common stock from warrant exercises (in shares)   4,457,757      
Sale of common stock, net of issuance costs 295,982 $ 1 295,981    
Sale of common stock, net of issuance costs (in shares)   30,775,000      
Unrealized gain (loss) on investments (97)       (97)
Net loss (16,823)     (16,823)  
Balance at Sep. 30, 2018 302,053 $ 1 399,847 (97,678) (117)
Balance (in shares) at Sep. 30, 2018   71,284,604      
Balance at Jun. 30, 2018 140,363 $ 1 231,587 (91,078) (147)
Balance (in shares) at Jun. 30, 2018   60,652,794      
Employee stock-based compensation 747   747    
Employee stock-based compensation (in shares)   (205)      
Issuance of common stock under employee stock plans 157   157    
Issuance of common stock under employee stock plans (in shares)   21,604      
Issuance of common stock from warrant exercises 2,342   2,342    
Issuance of common stock from warrant exercises (in shares)   1,110,411      
Sale of common stock, net of issuance costs 165,014   165,014    
Sale of common stock, net of issuance costs (in shares)   9,500,000      
Unrealized gain (loss) on investments 30       30
Net loss (6,600)     (6,600)  
Balance at Sep. 30, 2018 $ 302,053 $ 1 $ 399,847 $ (97,678) $ (117)
Balance (in shares) at Sep. 30, 2018   71,284,604