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The Company and Subsequent Events - Summary of Reconciliation of Beginning and Ending Restructuring Liability (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Restructuring Cost And Reserve [Line Items] |  |
Balance, beginning of period |  |
Additions, charged to costs | $ 6,215 | $ 7,080
Payments and impairments |  | (5,143)
Balance, end of period | 1,937 | 1,937
One-Time Employee Termination Benefit Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Balance, beginning of period |  |
Additions, charged to costs |  | 2,828
Payments and impairments |  | (1,951)
Balance, end of period | 877 | 877
Contract Termination Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Balance, beginning of period |  |
Additions, charged to costs |  | 446
Payments and impairments |  | (18)
Balance, end of period | 428 | 428
Consulting Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Balance, beginning of period |  |
Additions, charged to costs |  | 1,499
Payments and impairments |  | (867)
Balance, end of period | $ 632 | 632
Asset Disposal Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Additions, charged to costs |  | 2,307
Payments and impairments |  | $ (2,307)

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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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