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Organization and Significant Accounting Policies - Concentration Risk and Significant Customers (Details) | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Distributor A |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of revenue | 17.00% | 15.00% | 16.00% | 15.00% |
Percentage of accounts receivable | 20.00% |  | 20.00% |  | 19.00%
Distributor B |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of revenue | 11.00% |  | 12.00% | 13.00% |
Percentage of accounts receivable | 11.00% |  | 11.00% |  | 15.00%
Distributor C |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of revenue | 12.00% |  | 10.00% |  |
Percentage of accounts receivable | 13.00% |  | 13.00% |  |

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