Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Options Outstanding (Details)

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Stockholders' Equity - Options Outstanding (Details) - Employee Stock Option - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Balance at the beginning of the period (in shares) 7,568,304 8,265,207  
Granted (in shares) 2,477,486 1,033,000  
Exercised (in shares) (197,640) (41,968)  
Forfeited/Cancelled (in shares) (283,631) (1,687,935)  
Balance at the end of the period (in shares) 9,564,519 7,568,304 8,265,207
Vested or expected to vest at the end of the period (in shares) 9,564,519    
Exercisable at the end of the period (in shares) 5,536,713    
Weighted-Average Exercise Price      
Balance at the beginning of the period (in dollars per share) $ 3.40 $ 3.99  
Granted (in dollars per share) 1.90 1.10  
Exercised (in dollars per share) 0.68 0.68  
Forfeited/Cancelled (in dollars per share) (3.33) (4.94)  
Balance at the end of the period (in dollars per share) 3.07 $ 3.40 $ 3.99
Vested or expected to vest at the end of the period (in dollars per share) 3.07    
Exercisable at the end of the period (in dollars per share) $ 3.88    
Intrinsic value of options exercisable $ 1.6    
Closing price of Company's stock (in dollars per share) $ 2.14    
Weighted Average Remaining Contractual Term      
Options Outstanding at the end of the period 7 years 2 months 1 day 7 years 3 days 6 years 11 months 26 days
Vested or expected to vest at the end of the period 7 years 2 months 1 day    
Exercisable at the end of the period 5 years 11 months 8 days