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General - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Number of operating segments | 1 |  |
Number of Reportable segment | 1 |  |
Trade receivables | $ | $ 200,479 | $ 181,368 |
Credit Concentration Risk | Revenue |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percentage of revenue derived from distribution channels | 37.00% | 38.00% | 37.00%
Credit Concentration Risk | Revenue | First Channel Partner |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percentage of revenue derived from distribution channels | 19.00% | 20.00% | 21.00%
Credit Concentration Risk | Revenue | Second Channel Partner |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percentage of revenue derived from distribution channels | 18.00% | 18.00% | 16.00%

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