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Summary of Significant Accounting Policies - Summary of Effect of Adopting ASC 606 In Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 5,375 | $ 3,950 | $ 7,788 | $ (1,733) | $ 2,093 | $ 3,953 | $ 6,064 | $ 3,030 | $ 15,380 | $ 15,140 | $ 17,651
Accounts receivable |  |  |  |  |  |  |  |  | 2,588 | (10,327) | 7,963
Deferred commissions |  |  |  |  |  |  |  |  | (1,077) | (1,679) | 1,477
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  | 285 | (4,146) | 861
Deferred revenue |  |  |  |  |  |  |  |  | (604) | $ 8,586 | $ (5,140)
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 13,982 |  |
Accounts receivable |  |  |  |  |  |  |  |  | (1,952) |  |
Deferred commissions |  |  |  |  |  |  |  |  | (994) |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  | (43) |  |
Deferred revenue |  |  |  |  |  |  |  |  | $ 5,580 |  |

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