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Investments in Privately-held Companies (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Summary of investments [Abstract] |  |  |
Income allocated to minority interests | $ 205,000 | $ 441,000 |
Investments in unconsolidated privately-held entities, included in other assets | 200,000 |  | 200,000
AXT, Inc. [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 2,119,000 | 1,295,000 |
Equity Method Investments [Member] |  |  |
Summary of investments [Abstract] |  |  |
Equity method investment by parent | 7,641,000 |  | 7,537,000
Number of equity investment entities | 3 |  |
Minority investment in consolidated joint venture, included in other assets | 3,400,000 |  | 3,400,000
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 487,000 | 282,000 |
Joint Ventures [Member] |  |  |
Summary of investments [Abstract] |  |  |
Number of consolidated joint ventures | 3 |  |
Income from three consolidated joint ventures | 800,000 | 1,300,000 |
Income allocated to minority interests | 205,000 | 441,000 |
Net income from joint ventures attributable to parent | 548,000 | 852,000 |
Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 5,269,000 |  | 5,269,000
Beijing JiYa Semiconductor Material Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 3,331,000 |  | 3,331,000
Percentage of ownership, consolidated method (in hundredths) | 46.00% |  |
Nanjing Jin Mei Gallium Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 592,000 |  | 592,000
Percentage of ownership, consolidated method (in hundredths) | 83.00% |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 1,346,000 |  | 1,346,000
Percentage of ownership, consolidated method (in hundredths) | 70.00% |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] | Equity Method Investments [Member] |  |  |
Summary of investments [Abstract] |  |  |
Equity method investment by parent | 1,867,000 |  | 1,900,000
Percentage of ownership, equity method (in hundredths) | 46.00% |  |
Xilingol Tongli Germanium Co. Ltd [Member] | Equity Method Investments [Member] |  |  |
Summary of investments [Abstract] |  |  |
Equity method investment by parent | 4,849,000 |  | 4,692,000
Percentage of ownership, equity method (in hundredths) | 25.00% |  |
Emeishan Jia Mei High Purity Metals Co., Ltd [Member] | Equity Method Investments [Member] |  |  |
Summary of investments [Abstract] |  |  |
Equity method investment by parent | $ 925,000 |  | $ 945,000
Percentage of ownership, equity method (in hundredths) | 25.00% |  |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee excludes equity method investees invested by consolidated joint ventures. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References No definition available. + Details
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- Definition Total investments in (A) entities in which the entity has significant influence and control, (B) joint ventures that are consolidated, but (C) entities in which local management manage daily operations, (D) entities that not required additional investment of financial support from the parent entity. + References No definition available. + Details
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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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- Definition Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683 + Details
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