Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Options Outstanding (Details)

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Stockholders' Equity - Options Outstanding (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Number of Shares    
Balance at the beginning of the period (in shares) 8,265,207  
Granted (in shares) 1,033,000  
Exercised (in shares) (30,225)  
Forfeited/Cancelled (in shares) (1,589,561)  
Balance at the end of the period (in shares) 7,678,421 8,265,207
Vested or expected to vest at the end of the period (in shares) 7,678,421  
Exercisable at the end of the period (in shares) 4,100,616  
Weighted-Average Exercise Price    
Balance at the beginning of the period (in dollars per share) $ 3.99  
Granted (in dollars per share) 1.10  
Exercised (in dollars per share) 0.68  
Forfeited/Cancelled (in dollars per share) (5.00)  
Balance at the end of the period (in dollars per share) 3.41 $ 3.99
Vested or expected to vest at the end of the period (in dollars per share) 3.41  
Exercisable at the end of the period (in dollars per share) $ 4.41  
Weighted Average Remaining Contractual Term    
Options Outstanding at the end of the period 7 years 1 month 28 days 6 years 11 months 27 days
Vested or expected to vest at the end of the period 7 years 1 month 28 days  
Exercisable at the end of the period 5 years 9 months 26 days  
Intrinsic value of options exercisable $ 0.1  
Offering price $ 0.97