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Convertible Preferred Stock and Stockholders' Equity (Details 2) - Employee And Non Employee Stock Option
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Number of Options  
Balance at the beginning of the period | shares 3,910,350
Granted | shares 2,438,980
Canceled | shares (559,571)
Exercised | shares (70,649)
Balance at the end of the period | shares 5,719,110
Weighted-Average Price  
Balance at the beginning of the period | $ / shares $ 3.77
Granted | $ / shares 3.04
Canceled | $ / shares 3.59
Exercised | $ / shares 2.74
Balance at the end of the period | $ / shares $ 3.49