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Income Tax Provision (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 22, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Provision (Textual) |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 2,600 | $ 136,000
Percentage of statutory federal rate |  | 21.00% | 31.50% |  |
Percentage of deferred tax benefits |  | 21.00% |  |  |
Net operating loss carryforwards |  | Dec. 31, 2024 |  |  |
Federal net operating loss carryforwards |  | $ 70,500 | $ 54,300 |  |
State net operating loss carryforwards |  | 70,500 | 54,300 |  |
Estimated limitation revalued the losses and credits |  | 0 | 22,000 |  |
Valuation allowance |  | $ (16,025) | $ (7,038) |  |
Income tax, description |  | Of the $70.5 million of federal net operating loss carryforwards, $54.3 million was generated in tax years beginning before March 31, 2018 and is subject to the 20-year carryforward period ("pre-Tax Act losses"), the remaining $16.2 million ("post-Tax Act losses") can be carried forward indefinitely but is subject to the 80% taxable income limitation. |  |  |
Maximum [Member] |  |  |  |  |
Income Tax Provision (Textual) |  |  |  |  |
Percentage of corporate income tax rate | 35.00% |  |  |  |
Minimum [Member] |  |  |  |  |
Income Tax Provision (Textual) |  |  |  |  |
Percentage of corporate income tax rate | 21.00% |  |  |  |

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