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Stock-Based Compensation - Summary of Options Granted to Employees and Non-Employees (Details)
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Options, Outstanding, beginning | shares 1,938,534
Number of Options, Granted | shares 273,000
Number of Options, Exercised/ Expired/Forfeited | shares (25,908)
Number of Options, Outstanding at ending | shares 2,185,626
Number of Options, Exercisable | shares 999,446
Number of Options, Expected to be vested | shares 1,186,180
Weighted Average Exercise Price, Outstanding, beginning | $ / shares $ 7.081
Weighted Average Exercise Price, Granted | $ / shares 1.525
Weighted Average Exercise Price, Exercised/ Expired/Forfeited | $ / shares 1.131
Weighted Average Exercise Price, Outstanding at ending | $ / shares 6.457
Weighted Average Exercise Price, Exercisable | $ / shares 5.606
Weighted Average Exercise Price, Expected to be vested | $ / shares $ 7.175