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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Accrued interest and penalties related to uncertain tax positions | $ 0 | $ 0 | $ 0 |  |
Operating loss carry-forwards |  |  | 10,600,000 |  |
Tax reform, additional income tax benefit | 125,000 |  |  |  |
Tax reform, additional tax expense | 5,900,000 |  |  |  |
Tax reform, reduction of valuation allowance | 5,900,000 |  |  |  |
Deferred tax assets, operating loss carry-forwards | 8,610,000 | 8,610,000 | 9,239,000 | $ 5,384,000 |
Operating loss carry-forwards, subject to expiration | 54,200,000 | 54,200,000 |  |  |
Net deferred tax liabilities | 0 | 0 | 0 |  |
(Benefit from) provision for income taxes |  | (115,000) | $ 27,000 | $ 149,000 |
Scenario, forecast |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carry-forwards |  |  |  |  | $ 37,300,000
Research tax credit carry-forward |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating loss carry-forwards | 299,000 | 299,000 |  |  |
Domestic tax authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carry-forwards | 91,800,000 | 91,800,000 |  |  |
Deferred tax assets, operating loss carry-forwards | $ 37,300,000 | $ 37,300,000 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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