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General - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 Segment | Jan. 01, 2019 USD ($)
Schedule Of Accounting Policies [Line Items] |  |
Number of reportable segments | Segment | 1 |
Deferred commission expected amortization period | 2 years |
ASU 2016-02 [Member] | Subsequent Event [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Operating leases, right of use assets |  | $ 15.0
Operating leases, lease liabilities |  | $ 15.0
Minimum [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Hosting services arrangement period | 4 years |
Minimum [Member] | Subscriber Relationships [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of intangible assets | 3 years |
Minimum [Member] | Non-competition Agreements [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of intangible assets | 2 years |
Minimum [Member] | Technology and Other [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of intangible assets | 1 year |
Maximum [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Hosting services arrangement period | 5 years |
Maximum [Member] | Subscriber Relationships [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of intangible assets | 10 years |
Maximum [Member] | Non-competition Agreements [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of intangible assets | 5 years |
Maximum [Member] | Technology and Other [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of intangible assets | 10 years |
Computer Equipment and Software [Member] | Minimum [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of property and equipment | 2 years |
Computer Equipment and Software [Member] | Maximum [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of property and equipment | 3 years |
Office Equipment and Furniture [Member] | Minimum [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of property and equipment | 5 years |
Office Equipment and Furniture [Member] | Maximum [Member] |  |
Schedule Of Accounting Policies [Line Items] |  |
Estimated useful lives of property and equipment | 7 years |

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