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Contract Balances - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Contract With Customer Asset And Liability [Line Items] |  |  |
Bad debt expense | $ 165,000 | $ 1,044,000 |
Prepaid Expenses and Other Current Assets |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |
Assets impairment charges | 0 | 0 |
Contract assets | 1,900,000 |  | $ 1,200,000
Current Deferred Revenue and Advanced Payments |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |
Revenue recognized from beginning deferred revenue | $ 74,600,000 | $ 74,800,000 |

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