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Note Receivable - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2013 | Dec. 31, 2013 | Dec. 31, 2013 Wisepower | Jan. 24, 2013 Wisepower | Jan. 31, 2011 Wisepower
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Note Receivable, face amount |  |  |  |  | $ 2.5
Shares received as consideration for the sale of Note |  |  |  | 1,570,000 |
Shares issued under public offering, value | 36.0 | 60.0 | 1.4 |  |
Note receivable future payment, reserve |  | 1.1 |  |  |
Notes receivable, carrying value |  |  | $ 0 |  |

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- Definition Note Receivable Future Payment, Reserve + References No definition available. + Details
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- Definition Sale Of Note Consideration Received Shares + References No definition available. + Details
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- Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The principal amount of the receivable or note before consideration of the discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition The receivable or note face amount less the unamortized discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 + Details
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