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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Federal Tax Benefit at Statutory Rate | $ 3,334 | $ 1,335
State Tax Benefit Net of Federal | (117) | 137
IPO Costs | (76) | (227)
Stock Warrant Costs | (395) | 0
Other Permanent Differences | (9) | (3)
Change in Deferred Tax Rate due to Tax Reform | (1,562) | 0
Other | (11) | 0
Increase in Valuation Allowance | (1,164) | (1,242)
Total Tax (Expense) / Benefit | $ 0 | $ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Federal Tax Benefit at Statutory Rate (percentage) | 34.00% | 34.00%
State Tax Benefit Net of Federal (percentage) | (1.20%) | 3.48%
IPO Costs (percentage) | (0.77%) | (5.78%)
Stock Warrant Costs (percentage) | (4.03%) | (0.00%)
Other Permanent Differences (percentage) | (0.09%) | (0.08%)
Change in Deferred Tax Rate (percentage) | (15.93%) | (0.00%)
Other (percentage) | (0.11%) | (0.00%)
Increase in Valuation Allowance (percentage) | (11.87%) | (31.62%)
Total Tax (Expense) / Benefit (percentage) | (0.00%) | (0.00%)

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