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Other Investments - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) Agreement | Dec. 31, 2015 USD ($) | Dec. 31, 2008 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Gain from equity method investment |  |  |  | $ 5,000,000 |
Great Wall Semiconductor Corporation (GWS) [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Gross investment |  |  | $ 4,999,719 |  | $ 0
Gain from equity method investment | $ 4,999,719 |  | $ 4,999,719 |  |
Number of supply agreements with GWS | Agreement |  |  | 2 |  |
Purchase of components under agreement |  | $ 1,662,000 |  |  |

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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=77990344&loc=d3e5747-111685 + Details
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