Stockholders' Equity (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Number of Shares
Outstanding at end of year	3,323,876	7,163
Employee
Number of Shares
Outstanding at beginning of year	1,983,876
Employee Options granted	1,310,000
Non-employee options exercised
Non-employee options cancelled
Outstanding at end of year	3,293,876	1,983,876
Options vested and expected to vest	3,293,876
Options vested and exercisable	1,646,126
Weighted Average Exercise Price
Outstanding at beginning of year	$ 7.14
Employee Options granted	$ 5.73
Outstanding at end of year	$ 6.58	$ 7.14
Options vested and expected to vest	$ 6.51
Options vested and exercisable	$ 6.59
Aggregate Intrinsic Value
Aggregate intrinsic value of share outstanding, beginning	$ 1,935,990
Aggregate intrinsic value of share outstanding, beginning		1,935,990
Options vested and expected to vest
Options vested and exercisable
Weighted Average Remaining Contractual Life
Weighted average remaining contractual life of share outstanding	7 years 3 months 18 days	9 years 2 months 12 days
Weighted average remaining contractual life of share Options granted		5 years 2 months 6 days
Options vested and expected to vest	7 years 6 months
Options vested and exercisable	7 years 2 months 1 day