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Income Taxes (Additional Disclosures) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Operating loss carryforwards |  |  | $ 68,900,000 |  |
Deferred tax assets, operating loss carryforwards, subject to expiration |  |  | 49,600,000 |  |
Deferred tax assets, operating loss carryforwards, not subject to expiration |  |  | 19,300,000 |  |
Provisional expense for the effects of the 2017 Tax Act |  | $ 7,300,000 |  |  |
Provisional expense for remeasurement of net deferred tax assets for the effects of the 2017 Tax Act |  | 5,500,000 |  |  |
Provisional expense for unrepatriated earnings from foreign subsidiaries for the effects of the 2017 Tax Act |  | 200,000 |  |  |
Provisional expense for limitations on the deductibility of executive compensation for the effects of the 2017 Tax Act |  | $ 1,600,000 |  |  |
Valuation allowance |  |  | 19,878,000 | $ 4,042,000 | $ 15,500,000
Increase (decrease) in valuation allowance | $ (11,500,000) |  |  |  |
Net deferred tax assets | $ 18,700,000 |  | 36,000 | $ 18,663,000 |
Unremitted earnings outside the US |  |  | 2,300,000 |  |
Unrecognized tax benefits |  |  | $ 0 |  |

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