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Stockholders' Equity - Stock option activity (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares, Options exercised (in shares) (20,000) 0 (20,000) 0
Number of shares, Balance at end of the period (in shares) 2,310,485   2,310,485  
Number of shares, Options exercisable (in shares) 1,752,657   1,752,657  
Weighted average exercise price, Balance at end of the period (in dollars per share) $ 4.81   $ 4.81  
Weighted average exercise price, Options exercisable (in dollars per share) $ 5.69   $ 5.69  
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares, Balance at beginning of the period (in shares)     2,424,617  
Number of shares, Options granted (in shares) 24,000   79,000 80,000
Number of shares, Options exercised (in shares)     (20,000)  
Number of shares, Options forfeited (in shares)     (21,221)  
Number of shares, Options cancelled (in shares)     (151,911)  
Number of shares, Balance at end of the period (in shares) 2,310,485   2,310,485  
Number of shares, Options exercisable (in shares) 1,752,657   1,752,657  
Weighted average exercise price, Balance at beginning of the period (in dollars per share)     $ 5.00  
Weighted average exercise price, Options granted (in dollars per share)     1.84  
Weighted average exercise price, Options exercised (in dollars per share)     2.81  
Weighted average exercise price, Options forfeited (in dollars per share)     2.17  
Weighted average exercise price, Options cancelled (in dollars per share)     6.93  
Weighted average exercise price, Balance at end of the period (in dollars per share) $ 4.81   4.81  
Weighted average exercise price, Options exercisable (in dollars per share) $ 5.69   $ 5.69