Convertible Preferred Stock, Stockholders' Deficit, and Warrants (Details 2) - $ / shares	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants exercisable	11,002,533	10,580,095
Exercise price	$ 5.12	$ 5
Equity classified warrants IPO Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants exercisable	10,579,695	10,580,095
Exercise price	$ 5	$ 5
Expiration Date	January 2022
Liability classified warrants Series A Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants exercisable	422,838
Exercise price	$ 8
Expiration Date	April 2024