Stockholders' Equity (Details 1) - Equity Incentive 2011 Plan [Member] - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Common shares, nonvested beginning of period	461,926	372,092
Common shares, granted	38,535	277,059
Common shares, vested	52,121	(147,759)
Common shares, forfeited	9,026	(39,466)
Common shares, nonvested end of period	439,314	461,926	372,092
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant date fair value, nonvested beginning of period	$ 3.84	$ 4.00
Weighted average grant date fair value, granted	3.68	3.84
Weighted average grant date fair value, vested	4.24	4.32
Weighted average grant date fair value, forfeited	4.00	3.44
Weighted average grant date fair value, nonvested end of period	$ 3.76	$ 3.84	$ 4.00
Weighted average remaining years to vest	2 years 9 months	2 years 9 months	3 years