Stockholders' Equity and Redeemable Convertible Preferred Stock (Details 1) - Warrant [Member]	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at beginnning | shares	2,304,888
Exercised | shares	(200,000)
Expired | shares	(854,577)
Outstanding at ending | shares	1,250,311
Exercisable at ending | shares	1,250,311
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at beginnning | $ / shares	$ 7.98
Exercised | $ / shares	3.80
Expired | $ / shares
Outstanding at ending | $ / shares	9.21
Exercisable at ending | $ / shares	$ 9.21
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Roll Forward]
Outstanding at beginnning | $
Outstanding at ending | $
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Remaining Contractual Life [Roll Forward]
Outstanding at beginnning	2 years 9 months 29 days
Outstanding at ending	3 years 10 months 28 days
Exercisable at ending	3 years 10 months 28 days