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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |
Accrued interest and penalties related to uncertain tax positions | $ 0 |  |  | $ 0
Operating loss carry-forwards |  |  |  | 10,600,000
Deferred tax assets, operating loss carry-forwards | 5,384,000 | $ 6,871,000 |  | 9,239,000
Operating loss carry-forwards, subject to expiration |  |  |  | 54,400,000
Net deferred tax liabilities | 0 |  |  | 0
Federal tax expense |  | $ 0 |  |
Scenario, forecast |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carry-forwards |  |  | $ 18,500,000 |
Research tax credit carry-forward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carry-forwards |  |  |  | 299,000
Domestic tax authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforward utilized | $ 6,200,000 |  |  |
Operating loss carry-forwards |  |  |  | 79,800,000
Deferred tax assets, operating loss carry-forwards |  |  |  | $ 25,400,000

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- Definition Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32672-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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