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Income Taxes (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred income tax assets:
Bad debt reserve	$ 75	$ 93
Accrued expenses	3,865	2,940
State taxes	91	78
Charitable contributions	402	330
Net operating loss	26,186	17,473
Stock options and restricted stock	7,752	6,163
Depreciation	1,661	2,089
Total deferred income tax assets	40,032	29,166
Valuation allowance	(38,390)	(27,703)	$ (16,653)	$ (11,861)
DEFERRED INCOME TAX ASSETS, NET	$ 1,642	$ 1,463

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