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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |  |  |  |
Increase in costs and expenses after reclassification |  |  | $ 34,781 |  | $ 68,578 |
Costs and expenses | $ 52,357 |  | $ 56,862 | $ 111,510 | $ 113,661 |
Deferred revenue | 843 |  |  | 843 |  | $ 265
Deferred evenue recognized into revenue |  | $ 265 |  |  |  |
Unbilled revenue in accounts receivable | $ 19,643 |  |  | $ 19,643 |  | $ 16,238

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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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