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Income Taxes - Income tax reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Provision for income taxes [Abstract] |  |
Income taxes using U.S federal statutory rate | $ (4,037) | $ (15,340)
Tax Cuts and Jobs Act |  | 143
Nondeductible interest | 2,273 | 6,912
Loss on extinguishment of debt | 236 | 10,174
Loss of tax benefit of federal net operating loss carryforwards | (588) | 5,067
Loss of tax benefit of state net operating loss carryforwards | 1,040 | 1,373
Loss of tax benefit of federal tax credit carryforwards | 495 | 324
Amortization of gain on IP migration |  | 767
State income taxes, net of federal benefit | (2,355) | (1,339)
Foreign rate differential | 1,166 | 1,196
Valuation allowance | 6,323 | (1,423)
Derivative charge | (4,138) | (8,403)
Stock option exercises and cancellations | 215 | 841
Research and development costs | (636) | (295)
Other | $ 6 | $ 3

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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to derivative costs. + References No definition available. + Details
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