Stockholders' Equity and Redeemable Convertible Preferred Stock (Details 2) - USD ($) None in scaling factor is -9223372036854775296	1 Months Ended	6 Months Ended
	May. 24, 2015	Jun. 30, 2015
Number of Shares
Options expired	(176)
Employee
Number of Shares
Outstanding at beginning of year		5,243,877
Options forfeited		(250,000)
Options expired		(176)
Outstanding at end of year		4,993,701
Options vested and expected to vest		4,993,701
Options vested and exercisable		4,993,576
Weighted Average Exercise Price
Outstanding at beginning of year		$ 4.97
Options forfeited
Options expired
Outstanding at end of year		$ 5.07
Options vested and expected to vest		5.07
Options vested and exercisable		$ 5.06
Total Intrinsic Value
Outstanding at beginning of year
Outstanding at end of year
Weighted Average Remaining Contractual Life (in years)
Weighted average remaining contractual life Outstanding, Beginning Balance		6 years
Weighted average remaining contractual life Outstanding, Ending Balance		5 years 7 months 6 days
Options vested and expected to vest		5 years 7 months 6 days
Options vested and exercisable		5 years 7 months 6 days