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Warrants and Derivative Liabilities - Additional Information (Detail) (USD $)	3 Months Ended							0 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended		0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Convertible Bond [Member]	Jun. 30, 2012 Convertible Bond [Member]	Jun. 30, 2013 Capital Ventures International [Member]	Jun. 30, 2012 Capital Ventures International [Member]	Jun. 30, 2012 Hercules Technology Growth Capital [Member]	Apr. 04, 2012 Senior Convertible Debt [Member] Capital Ventures International [Member]	Apr. 04, 2010 Senior Convertible Debt [Member] Capital Ventures International [Member]	Dec. 31, 2012 New Unsecured Senior Convertible Note [Member] Capital Ventures International [Member]	Jun. 30, 2013 New Unsecured Senior Convertible Note [Member] Capital Ventures International [Member]	Dec. 31, 2012 New Unsecured Senior Convertible Note [Member] Capital Ventures International [Member] Minimum [Member]	Dec. 31, 2012 New Unsecured Senior Convertible Note [Member] Capital Ventures International [Member] Maximum [Member]	Jun. 05, 2012 Senior Secured Term Loan [Member] Hercules Technology Growth Capital [Member]
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock								3,094,060						139,276
Warrant exercise, waiting period					6 months
Warrant exercise period					5 years
Exercise price								$ 5.45						$ 3.59
Beneficial ownership limitation percentage												4.99%	9.99%
Required notification period					61 days
Gain (loss) in change of fair value of derivative instruments and warrants	$ 469,000	$ (2,388,000)	$ 100,000	$ (700,000)	$ 400,000	$ (1,600,000)	$ (100,000)
Conversion price									$ 4.85			$ 3.19	$ 4.85
Increase in derivative liability										$ 500,000	$ 500,000
Convertible debt instrument redemption waiting period	1 year
Convertible debt instrument contractual term	30 months

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- Definition

Purchase commitment issuance of warrants shares of common stock.

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Warrant exercise period.

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- Definition

Warrant exercise waiting period.

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- Definition

Exercise price of the warrants.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column A

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The price per share of the conversion feature embedded in the debt instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959



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