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Revenue Recognition- Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Jan. 01, 2018
Deferred Revenue |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred revenues (Short-term contract liability) | $ 1,295,000 |
ASU 2014-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Impact to revenues | 1,963,000 |
Capitalized contract acquisition costs |  | $ 239,000
Capitalized contract cost, amortization | 11,000 |
Impairment loss in relation to costs capitalized | 0 |
ASU 2014-09 | Accrued Revenues |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New accounting pronouncement or change in accounting principle cumulative effect of change on equity or net assets | $ 6,611,000 |
ASU 2014-09 | Retained Earnings |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New accounting pronouncement or change in accounting principle cumulative effect of change on equity or net assets |  | $ 8,555,000

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