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Debt (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt, Principal | $ 2,157 | $ 7,773
Total debt, Unamortized amount | 0 | (49)
Total debt | 2,157 | 7,724
Less: debt - current, Principal | (2,157) | (4,857)
Less: debt - current, Unamortized Discount | 0 | 29
Less: debt - current | (2,157) | (4,828)
Debt - non-current, Principal | 0 | 2,916
Debt - non-current, Unamortized Discount | 0 | (20)
Debt - non-current | 0 | 2,896
Comerica - Growth Capital Loan A, due 2015 |  |
Debt Instrument [Line Items] |  |
Total debt, Principal |  | 4,583
Total debt, Unamortized amount |  | (49)
Total debt |  | 4,534
Comerica - Revolving Line of Credit, due 2014 |  |
Debt Instrument [Line Items] |  |
Total debt, Principal | 2,157 | 3,190
Total debt, Unamortized amount | 0 | 0
Total debt | $ 2,157 | $ 3,190

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or 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 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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