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Restructuring Expenses - Additional Information (Details) $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Aug. 18, 2014 USD ($) | May 22, 2014 USD ($) | Sep. 30, 2018 Lease
Lease Liability [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Number of sub leases | Lease |  |  | 2
Sub-lease 1 [Member] | Facility Closing [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring reserve charges |  | $ 0.9 |
Sub Lease 2 [Member] | Facility Closing [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring reserve charges | $ 0.7 |  |

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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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