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Restructuring - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2017
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Percentage of reduction in global workforce | 40.00% |  |  |  |
Restructuring |  |  |  |  | $ 2,783,000
Employee Severance and Other Benefits |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring |  | $ 0 | $ 0 | $ 2,800,000 | 2,783,000
Cash payments |  |  |  |  | $ 2,738,000

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with 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 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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