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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

X

- Definition

Current portion carrying value of the debt instrument before deducting unamortized discounts (if any).

+ References

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X

- Definition

Non-current portion carrying value of the debt instrument before deducting unamortized discounts (if any).

+ References

No definition available.

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X

- Definition

Current portion of the unamortized discounts on the debt instrument.

+ References

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X

- Definition

Non-current portion of the unamortized discounts on the debt instrument.

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X

- 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



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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X

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-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.



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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5



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-Publisher FASB

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-Topic 944

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- Definition

Carrying value as of the balance sheet date of the portion of long-term, collateralized debt obligations due within one year or the operating cycle, if longer. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

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