Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Computation of Potentially Dilutive Securities (Details)

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Summary of Significant Accounting Policies - Schedule of Computation of Potentially Dilutive Securities (Details) - shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Total potential dilutive securities (in shares) 6,129,550 3,668,211
Convertible note - principal    
Total potential dilutive securities (in shares) 0 702,247
Options to purchase common stock    
Total potential dilutive securities (in shares) 3,440,437 561,536
Unvested restricted stock units    
Total potential dilutive securities (in shares) 244,785 63,600
Financing warrants to purchase common stock    
Total potential dilutive securities (in shares) 2,444,328 2,340,828