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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |  |  |
Payment terms |  |  | The Company’s standard payment terms are generally within 180 days of invoicing. If extended payment terms are granted to customers, those terms generally do not exceed one year. |  |
Description of warranty |  |  | The standard software assurance warranty period is generally less than one year. |  |
Amortization period for capitalized contract costs | 3 years |  | 3 years |  |
Product support period |  |  | 1 year |  |
Capitalized cost to obtain customer contracts net | $ 4.0 |  | $ 4.0 |  | $ 4.5
Amortization expenses related to capitalized cost | $ 0.4 | $ 0.7 | $ 1.1 | $ 1.4 |

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