Stockholders' Equity - Schedule of Nonvested Stock Option (Details) - Equity Incentive 2011 Plan [Member] - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Common shares, nonvested beginning of period	414,306	461,926
Common shares, granted	94,246	179,998
Common shares, vested	(161,321)	(187,181)
Common shares, forfeited	(19,298)	(40,437)
Common shares, nonvested end of period	327,933	414,306	461,926
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	$ 3.60	$ 3.84
Weighted average grant date fair value, granted	1.28	2.88
Weighted average grant date fair value, vested	3.52	4.00
Weighted average grant date fair value, forfeited	3.12	3.76
Weighted average grant date fair value, nonvested end of period	$ 2.72	$ 3.60	$ 3.84
Weighted average remaining years to vest	2 years 7 months	2 years 7 months	2 years 9 months