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Summary of Significant Accounting Policies - Summary of Effect of Adopting ASC 606 In Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Accounts receivable, net | $ 67,318 | $ 70,023 |  |
Deferred commissions | 15,677 | 13,731 |  |
Prepaid expenses and other current assets | 12,802 | 18,942 |  |
Total current assets | 236,093 | 236,819 |  |
Other assets | 5,310 | 6,231 |  |
Total assets | 353,524 | 345,200 |  |
Deferred revenue | 135,332 | 145,207 |  |
Total current liabilities | 189,985 | 195,053 |  |
Total liabilities | 201,924 | 204,011 |  |
Retained earnings | 127,717 | 123,010 |  |
Total stockholders’ equity | 151,600 | 141,189 | $ 150,036 | $ 127,302
Total liabilities and stockholders’ equity | 353,524 | $ 345,200 |  |
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member] |  |  |  |
Accounts receivable, net | 71,858 |  |  |
Deferred commissions | 14,725 |  |  |
Prepaid expenses and other current assets | 18,587 |  |  |
Total current assets | 245,467 |  |  |
Other assets | 4,748 |  |  |
Total assets | 362,336 |  |  |
Deferred revenue | 149,344 |  |  |
Total current liabilities | 203,997 |  |  |
Total liabilities | 215,936 |  |  |
Retained earnings | 122,517 |  |  |
Total stockholders’ equity | 146,400 |  |  |
Total liabilities and stockholders’ equity | $ 362,336 |  |  |

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