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Description of Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset	$ 52,539		$ 54,166
Deferred tax asset, valuation allowance	52,275		$ 53,598
ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset		$ 5,300
Deferred tax asset, valuation allowance		5,300
Accumulated Deficit | ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect on financial statements		$ 200
Pro Forma | Minimum | Accumulated Deficit | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect on financial statements	18,000
Pro Forma | Maximum | Accumulated Deficit | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect on financial statements	$ 28,000

X

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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