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Other Investments - Additional Information (Detail) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Variable Interest Entity [Line Items] |  |  |
Ownership interest in investment | 27.00% |  | 27.00%
Purchase of components under agreement | $ 831,000 | $ 1,210,000 |
Allocation of equity method income (loss) | 0 | 0 |
Great Wall Semiconductor Corporation (GWS) [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investment in non-voting convertible preferred stock | 0 |  | 0
Great Wall Semiconductor Corporation (GWS) [Member] | Convertible Preferred Stock [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investment in non-voting convertible preferred stock | $ 5,000,000 |  | $ 5,000,000

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- Definition The amount of income (loss) from operations derived by the reporting entity during the period from the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
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- Definition The amount of purchases between the reporting entity and the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
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