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Subsequent Events - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2012 | Sep. 30, 2012 | Jan. 31, 2013 Subsequent Events [Member] | Mar. 29, 2013 Subsequent Events [Member] | Jan. 24, 2013 Subsequent Events [Member]
Subsequent Event [Line Items] |  |  |  |  |  |
Note receivable |  |  |  |  |  | $ 2,500,000
Common stock value | 110,420 | 110,420 | 108,354 |  | 2,500,000 | 1,600,000
Shares issued under public offering | 1,800,000 |  |  | 1,667,051 |  |
Shares issued under public offering, price per share | $ 2.26 | $ 2.26 |  | $ 2.12 |  |
Unit sold, description | Each unit consisted of one share of Common Stock and a warrant to purchase |  |  | Each unit consisted of one share of Common Stock and a warrant to purchase |  |
Warrant to purchase share of Common Stock | 0.5 | 0.5 |  | 0.5 |  |
Exercise price of warrant | 2.12 | 2.12 |  | 2.14 |  |
Gross proceeds from offering | $ 3,900,000 | $ 3,300,000 |  | $ 3,300,000 |  |

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + 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 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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