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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) customer | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of customers | customer | 2 |  |
Percentage of revenue | 10.00% |  |
Percentage of accounts receivable | 10.00% |  |
Sales returns coverage period | 30 days |  |
Unbilled accounts receivable | $ 4.7 |  | $ 5.1
Deferred revenue recognized | $ 2.4 | $ 1.5 |
Amortization period for incentive compensation costs | 1 year |  |
Distributor A |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of revenue | 15.00% | 13.00% |
Percentage of accounts receivable | 17.00% |  | 19.00%
Distributor B |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of revenue | 11.00% | 14.00% |
Percentage of accounts receivable | 11.00% |  | 15.00%

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