Quarterly report pursuant to Section 13 or 15(d)

Stock Options - Summary of Assumptions Used Principally in Determining Fair Value of Options Granted (Details)

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Stock Options - Summary of Assumptions Used Principally in Determining Fair Value of Options Granted (Details) - Employee Stock Option [Member]
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk free interest rate 1.73% 1.98%
Expected dividend yield 0.00% 0.00%
Expected term in years 6 years 7 months 21 days 8 years 7 months 2 days
Expected volatility 90.60% 97.00%
Estimated forfeiture rate 5.00% 0.65%