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]
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk free interest rate 2.34% 2.17%
Expected dividend yield 0.00% 0.00%
Expected term in years 6 years 2 months 30 days 6 years 4 months 6 days
Expected volatility 88.10% 85.80%
Estimated forfeiture rate 5.00% 5.00%