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Restructuring Charges - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 19, 2016 Employee | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Employee | Jun. 30, 2016 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | [1]
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  | $ 1,460 | $ (21) | $ 3,480 | $ 15 |  |  |
Accrued restructuring expenses |  | 1,020 |  | $ 1,020 |  |  |  | $ 3,594
2016 Restructuring [Member] |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Number of employees terminated | Employee | 57 |  |  |  |  |  |  |
2017 Restructuring [Member] |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Number of employees terminated | Employee |  |  |  | 5 |  |  |  |
2017 and 2016 Restructuring [Member] |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Payments for restructuring expenses |  | 6,100 |  |  |  |  |  |
Accrued restructuring expenses |  | 1,000 |  | $ 1,000 |  |  |  |
2017 and 2016 Restructuring [Member] | Severance, Other Termination Benefits and Outplacement Services [Member] |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  | $ 1,500 |  | $ 3,500 |  |  |  |
2017 and 2016 Restructuring [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Expected remaining future payments for restructuring |  |  |  |  |  |  | $ 900 |
2017 and 2016 Restructuring [Member] | Forecast [Member] | Executive Severance [Member] |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Expected remaining future payments for restructuring |  |  |  |  |  | $ 100 |  |
[1] | The condensed consolidated balance sheet as of December 31, 2016 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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