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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) customer SalesChannel | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of sales channels | SalesChannel |  | 2 |  |
Number of customers | customer |  | 2 |  |
Maturity threshold of investments classified to cash equivalents |  | 90 days |  |
Percentage of net revenues |  | 10.00% |  |
Percentage of accounts receivable attributable to major customer |  | 10.00% |  |
Sales return period |  | 30 days |  |
Unbilled Contracts Receivable |  | $ 5,100,000 |  |
Goodwill and intangible asset impairment |  | 0 | $ 0 | $ 0
Goodwill accumulated impairment losses |  |  |  | 0
Amount of recognized deferred revenue |  | 1,900,000 |  |
Advertising expense | $ 21,900,000 | $ 25,400,000 |  | $ 11,900,000
Amortization period for incentive compensation costs |  | 1 year |  |
Computer software and hardware |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  | 3 years |  |
Furniture and fixtures |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  | 5 years |  |
Byram |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of net revenues |  | 12.00% | 14.00% | 17.00%
Percentage of accounts receivable attributable to major customer | 12.00% | 15.00% | 12.00% |
Edgepark |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of net revenues |  | 15.00% | 16.00% | 14.00%
Percentage of accounts receivable attributable to major customer | 18.00% | 19.00% | 18.00% |
Minimum |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Customer contract payment terms |  | 30 days |  |
Useful life of finite-lived intangible assets |  | 2 years |  |
Minimum | Machinery and Equipment |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  | 4 years |  |
Maximum |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Customer contract payment terms |  | 90 days |  |
Useful life of finite-lived intangible assets |  | 5 years |  |
Maximum | Machinery and Equipment |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  | 15 years |  |

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