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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |
U.S. federal income tax rate (percent) | 34.00% | 34.00% | 34.00%
Undistributed earnings of foreign subsidiaries | $ 0 | $ 1,200,000 | $ 800,000
Limitation on use of net operating loss, cumulative ownership change, more than | 50.00% |  |
Limitation on use of net operating loss, cumulative ownership change, period of change | 3 years |  |
Decrease in deferred tax assets due to tax reform of 2017 | $ 26,000,000 |  |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Increase (decrease) in valuation allowance for deferred tax assets | (1,300,000) | $ 2,000,000 |
Net operating loss carryforwards | 188,800,000 |  |
Federal | Research and Development Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Research and development credit carryforwards | 2,800,000 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 104,400,000 |  |
State | Research and Development Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Research and development credit carryforwards | $ 2,400,000 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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