Stockholders' Equity and Redeemable Convertible Preferred Stock (Details 4) - Non-Employee [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Number of Shares
Outstanding at beginning of year	55,000
Options granted	0
Outstanding at end of year	55,000
Options vested and expected to vest	55,000
Options vested and exercisable	55,000
Weighted Average Exercise Price
Outstanding at beginning of year | $ / shares	$ 5.16
Options granted | $ / shares	0.00
Outstanding at end of year | $ / shares	5.16
Options vested and expected to vest | $ / shares	5.16
Options vested and exercisable | $ / shares	$ 5.16
Total Intrinsic Value
Outstanding at beginning of year | $	$ 0
Outstanding at end of year | $	$ 0
Weighted Average Remaining Contractual Life (in years)
Weighted average remaining contractual life Outstanding, Beginning Balance	6 years 4 months 24 days
Options granted	0 years
Weighted average remaining contractual life Outstanding, Ending Balance	5 years 8 months 12 days
Options vested and expected to vest	5 years 8 months 12 days
Options vested and exercisable	5 years 8 months 12 days