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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities: |  |
Net income (loss) | $ (1,733) | $ 3,030
Accounts receivable | 7,921 | 3,839
Deferred commissions | (122) | (235)
Prepaid expenses and other current assets | (5,454) | 138
Deferred revenue | 17,275 | $ 21,538
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member] |  |
Cash flows from operating activities: |  |
Net income (loss) | (209) |
Accounts receivable | 2,249 |
Deferred commissions | (75) |
Prepaid expenses and other current assets | (4,769) |
Deferred revenue | $ 20,691 |

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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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