The Company and Summary of Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
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

Period at which sales commissions are expected to be received.

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Percentage of Gallium.

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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