Summary of Stock Option and Stock Award Activities (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding beginning of period	1,068,515
Number of Options, Granted	121,780
Number of Options, Forfeited and cancelled	(183)
Options outstanding end of the period	1,190,112	1,068,515
Options exercisable, end of period, Number of Options	576,567
Options vested and expected to vest, Number of Options	1,188,716
Weighted Average exercise Price, Options Outstanding, Beginning of period	$ 2.89
Weighted average exercise price, Granted	$ 0.67
Weighted average exercise price, Forfeited and cancelled	$ 0.36
Weighted Average exercise Price, Options Outstanding, end of period	$ 2.66	$ 2.89
Weighted average exercise price, Options exercisable, end of period	$ 3.95
Weighted Average exercise Price, Options vested and expected to vest, end of period	$ 2.66
Weighted Average Remaining Contractual Term (in years) Options Outstanding	8 years 2 months 12 days	8 years 3 months
Options exercisable, Weighted Average Remaining Contractual Term (in years)	7 years 6 months 7 days
Options vested and expected to vest, Weighted Average Remaining Contractual Term (in years)	8 years 2 months 9 days