Stockholders' Equity and Redeemable Convertible Preferred Stock (Details 1) - Warrants - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Warrants
Outstanding at beginning of year	769,803
Issued	7,035,024
Outstanding at end of year	7,804,827	769,803
Exercisable as of September 30, 2015	769,803
Weighted Average Exercise Price
Outstanding at beginning of year	$ 13.70
Issued	0.43
Outstanding at end of year	1.74	$ 13.70
Exercisable as of September 30, 2015	$ 13.70
Total Intrinsic Value
Outstanding at beginning of year	$ 0
Outstanding at end of year	0	$ 0
Exercisable as of September 30, 2015	$ 0
Weighted Average Remaining Contractual Life (in years)
Weighted average remaining contractual life Outstanding	5 years 1 month 10 days	4 years 11 days
Weighted average remaining contractual life, Issued	5 years 3 months 22 days
Exercisable as of September 30, 2015	3 years 3 months 11 days