Stockholders' Equity - Schedule of Nonvested Stock Option (Details) - Equity Incentive 2011 Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Common shares, nonvested beginning of period	323,077	414,306
Common shares, granted	156,084	141,246
Common shares, vested	(137,206)	(205,469)
Common shares, forfeited	(41,445)	(27,006)
Common shares, nonvested end of period	300,510	323,077	414,306
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	$ 2.64	$ 3.60
Weighted average grant date fair value, granted	0.96	1.76
Weighted average grant date fair value, vested	2.80	3.36
Weighted average grant date fair value, forfeited	2.88	3.12
Weighted average grant date fair value, nonvested end of period	$ 0.80	$ 2.64	$ 3.60
Weighted average remaining years to vest	2 years 5 months	2 years 8 months	2 years 7 months