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Contract Balances - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Contract With Customer Asset And Liability [Line Items] |  |  |  |  |
Write-offs and sales allowances | $ 0 | $ 800,000 | $ 800,000 | $ 900,000 |
Revenue, Remaining performance obligation | 181,000,000.0 |  | 181,000,000.0 |  |
Prepaid Expenses and Other Current Assets |  |  |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |  |  |
Assets impairment charges | 0 | 0 | 0 | 0 |
Contract assets | 800,000 |  | 800,000 |  | $ 800,000
Current Deferred Revenue and Advanced Payments |  |  |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |  |  |
Revenue recognized from beginning deferred revenue | $ 51,000,000.0 | $ 56,800,000 | $ 118,000,000.0 | $ 131,300,000 |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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