Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Common Stock (Details)

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Stockholders' Equity - Common Stock (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]    
Cash proceeds from option exercises $ 781 $ 0
Cash proceeds from exercise of warrants $ 3,309 $ 0
Common Shares    
Class of Stock [Line Items]    
Issuance of common stock resulting from exercise of stock options (in shares) 453,209 0
Stock options to purchase shares of common stock (in shares) 182,471  
Cash proceeds from option exercises $ 800  
Issuance of common stock resulting from exercise of warrants (in shares) 1,505,026 0
Cash proceeds from exercise of warrants $ 3,300  
Common Shares | Cashless Exercise    
Class of Stock [Line Items]    
Issuance of common stock resulting from exercise of stock options (in shares) 83,491  
Net exercise of common stock shares underlying warrants (in shares) 89,330  
Issuance of shares of common stock from exercise (in shares) 49,127  
Common Shares | Cash-Based Awards    
Class of Stock [Line Items]    
Issuance of common stock resulting from exercise of stock options (in shares) 369,718  
Number of shares called by warrants (in shares) 1,455,899