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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current: |  |  |
State | $ 574 | $ 576 | $ 600
Total | 574 | 576 | 600
Income tax provision | $ 574 | $ 576 | $ 600
Reconciliation of effective tax rate and the U.S. federal statutory income tax rate |  |  |
Taxes at statutory U.S. federal income tax rate (as a percent) | 35.00% | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent | (35.00%) | (35.00%) | (35.00%)
State and local income taxes, net of federal tax benefit (as a percent) | 0.40% | 0.30% | 0.40%
Change in valuation allowance (as a percent) | 8.82% | 6.39% | 3.49%
Other differences, net (as a percent) | (8.82%) | (6.39%) | (3.49%)
Effective tax rate (as a percent) | 0.40% | 0.30% | 0.40%
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred income | $ 2,862 | $ 2,724 |
Other | 115 | 206 |
Tax loss carry forwards | 27,941 | 17,266 |
Deferred tax assets, gross | 30,918 | 20,196 |
Valuation allowance | $ (30,918) | $ (20,196) |
Percentage of valuation allowance provided | 100.00% | 100.00% |
Tax Credit Carryforward, Amount | $ 71,283 |  |

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