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The Company and Summary of Significant Accounting Policies - Foreign exchange gain (loss) (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) subsidiary company item | Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) item
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | company | 7 |  |
Number of consolidated subsidiaries | subsidiary | 3 |  |
Percentage of pure gallium products produces by joint ventures (in hundredths) | 99.99% |  |
Foreign Currency Translation [Abstract] |  |  |
Foreign exchange transaction exchange gains (losses) | $ | $ 232,000 | $ 717,000 | $ (999,000)
Joint Ventures [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of consolidated subsidiaries | item | 3 | 3 | 3

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
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