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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 99,800 | $ 72,600
Tax Credit Carryforward [Line Items] |  |
Deferred tax assets | (34,500) | (24,100)
Deferred tax assets, decrease in valuation allowance | (10,500) |
Change in Federal tax rate due to tax reform | 0 | 3,221
Provisional decrease to valuation allowance | 9,600 |
Reduction in net deferred tax liability | (6,300) |
Federal | R&D Credit Carryforward |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward | 1,200 | 1,000
State | R&D Credit Carryforward |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward | $ 1,200 | $ 1,100

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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