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The Company and Summary of Significant Accounting Policies - Revenue Recognition (Details) | 12 Months Ended |
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Dec. 31, 2018 USD ($) segment subsidiary | Dec. 31, 2017 USD ($)
Revenue Recognition |  |
Number of consolidated subsidiaries | subsidiary | 3 |
Percentage of Gallium | 99.99% |
Accounts receivable | $ 19,586,000 | $ 22,778,000
Accrued liabilities | 15,371,000 | 11,149,000
Revenue |  |
Contract liabilities | (476,000) | $ (924,000)
Amounts included in contract liabilities at the beginning of the period | $ 834,000 |
Number of operating segments | segment | 1 |
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract | true |
Revenue, Practical Expedient, Financing Component | true |
Revenue, Practical Expedient, Remaining Performance Obligation | true |
Adjustment | ASU 2014-09 |  |
Revenue Recognition |  |
Accounts receivable | $ 169,000 |
Accrued liabilities | $ 169,000 |
Maximum |  |
Revenue Recognition |  |
Sales commissions benefit period | 1 year |

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