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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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