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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cumulative adjustment to accumulated deficit |  |  |  | $ 207
Decrease in cash flows from financing activities as compared to previously reported amounts | $ (111,261) | $ (10,143) |  |
Accumulated Deficit |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cumulative adjustment to accumulated deficit |  |  |  | $ 207
ASU 2014-09 | ISU Abxis | Difference between Revenue Guidance in Effect before and after Topic 606 | Accumulated Deficit |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cumulative adjustment to accumulated deficit |  |  | $ 200 |
ASU 2016-18 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Decrease in cash flows from financing activities as compared to previously reported amounts | $ 13,900 |  |  |

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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