Income Taxes - Narrative (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Income Tax Contingency [Line Items] | ||
| Decrease in valuation allowance | $ 8,800 | |
| Federal income tax rate | 34.00% | |
| Uncertain tax positions accrued | $ 0 | $ 0 |
| Accrued interest and penalties related to uncertain tax positions | $ 0 | $ 0 |
| Maximum | ||
| Income Tax Contingency [Line Items] | ||
| Federal income tax rate | 35.00% | |
| Federal. | ||
| Income Tax Contingency [Line Items] | ||
| Net operating loss carryforwards | $ 68,700 | |
| State. | ||
| Income Tax Contingency [Line Items] | ||
| Net operating loss carryforwards | $ 500 |