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Interim Consolidated Financial Statements - Summary of Effect of Adopting ASC 606 In Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities: |  |  |  |
Net income | $ 7,788 | $ 6,064 | $ 6,055 | $ 9,094
Accounts receivable |  |  | 20,020 | 8,457
Deferred commissions |  |  | 2,086 | 1,475
Prepaid expenses and other current assets |  |  | 280 | 1,470
Deferred revenue |  |  | 6,533 | $ 9,611
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member] |  |  |  |
Cash flows from operating activities: |  |  |  |
Net income | $ 8,053 |  | 7,844 |
Accounts receivable |  |  | 16,466 |
Deferred commissions |  |  | 1,824 |
Prepaid expenses and other current assets |  |  | 1,125 |
Deferred revenue |  |  | $ 7,715 |

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