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Income Taxes - Income tax reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Provision for income taxes [Abstract] |  |
Income taxes using U.S federal statutory rate | $ (1,865) | $ (4,037)
Nondeductible interest | 994 | 2,273
Loss on extinguishment of debt | 361 | 236
Loss of tax benefit of federal net operating loss carryforwards |  | (588)
Loss of tax benefit of state net operating loss carryforwards | 1,477 | 1,040
Loss of tax benefit of federal tax credit carryforwards | 324 | 495
State income taxes, net of federal benefit | (1,461) | (2,355)
Foreign rate differential | 664 | 1,166
Valuation allowance | 3,512 | 6,323
Derivative charge | (3,674) | (4,138)
Stock option exercises and cancellations |  | 215
Research and development costs | (316) | (636)
Other | (16) | 6
Total | $ 0 | $ 0

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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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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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