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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities: |  |  |  |
Net income | $ 3,950 | $ 3,953 | $ 10,005 | $ 13,047
Accounts receivable |  |  | 31,857 | 20,140
Deferred commissions |  |  | 3,716 | 2,906
Prepaid expenses and other current assets |  |  | (68) | (979)
Deferred revenue |  |  | (8,205) | $ (3,473)
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member] |  |  |  |
Cash flows from operating activities: |  |  |  |
Net income | $ 3,136 |  | 10,980 |
Accounts receivable |  |  | 28,572 |
Deferred commissions |  |  | 3,447 |
Prepaid expenses and other current assets |  |  | 714 |
Deferred revenue |  |  | $ (6,408) |

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