Stockholders' Equity (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of Shares
Outstanding at end of year	5,298,877	2,013,876
Non Employee
Number of Shares
Outstanding at beginning of year	30,000
Non-employee options granted	25,000	30,000	30,000
Outstanding at end of year	55,000	30,000
Options vested and expected to vest	55,000
Options vested and exercisable	55,000
Weighted Average Exercise Price
Outstanding at beginning of year	$ 7.08
Non-employee options granted	$ 2.86	$ 7.08	$ 7.08
Outstanding at end of year	$ 5.16	$ 7.08
Options vested and expected to vest	$ 5.16
Options vested and exercisable	$ 5.16
Aggregate Intrinsic Value
Aggregate intrinsic value of share outstanding		$ 29,400
Non-employee options granted
Options vested and expected to vest
Options vested and exercisable
Weighted Average Remaining Contractual Life
Weighted average remaining contractual life of share outstanding	6 years 4 months 24 days	9 years 3 months 18 days
Weighted average remaining contractual life of share Options granted	4 years 3 months 18 days
Options vested and expected to vest	6 years 4 months 24 days
Options vested and exercisable	6 years 4 months 24 days