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Debt (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt, Principal | $ 6,995 | $ 7,773
Total debt, Unamortized amount | (40) | (49)
Total debt | 6,955 | 7,724
Less: debt - current, Principal | (4,495) | (4,857)
Less: debt - current, Unamortized Discount | 25 | 29
Less: debt - current | (4,470) | (4,828)
Debt - non-current, Principal | 2,500 | 2,916
Debt - non-current, Unamortized Discount | (15) | (20)
Debt - non-current | 2,485 | 2,896
Comerica - Growth Capital Loan A, due 2015 |  |
Debt Instrument [Line Items] |  |
Total debt, Principal | 4,167 | 4,583
Total debt, Unamortized amount | (40) | (49)
Total debt | 4,127 | 4,534
Comerica - Revolving Line of Credit, due 2014 |  |
Debt Instrument [Line Items] |  |
Total debt, Principal | 2,828 | 3,190
Total debt, Unamortized amount | 0 | 0
Total debt | $ 2,828 | $ 3,190

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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