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Warrants and Derivative Liabilities - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		3 Months Ended		9 Months Ended	3 Months Ended			0 Months Ended	3 Months Ended		9 Months Ended	0 Months Ended		3 Months Ended	0 Months Ended				1 Months Ended		0 Months Ended	3 Months Ended		0 Months Ended			3 Months Ended
	Nov. 15, 2013	Jun. 05, 2012	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2013 Convertible Bond	Jun. 30, 2014 Senior Secured Term Loan First Warrant	Jun. 30, 2013 Senior Secured Term Loan First Warrant	Mar. 02, 2014 Capital Ventures International	Jun. 30, 2014 Capital Ventures International	Jun. 30, 2013 Capital Ventures International	Dec. 31, 2013 Capital Ventures International	Oct. 09, 2013 Senior Convertible Debt Capital Ventures International	Apr. 04, 2012 Senior Convertible Debt Capital Ventures International	Jun. 30, 2014 Senior Convertible Debt Capital Ventures International	Mar. 02, 2014 New Unsecured Senior Convertible Note	Dec. 31, 2013 New Unsecured Senior Convertible Note	Dec. 31, 2012 New Unsecured Senior Convertible Note	Apr. 04, 2012 New Unsecured Senior Convertible Note	Dec. 31, 2012 New Unsecured Senior Convertible Note Capital Ventures International Minimum	Dec. 31, 2012 New Unsecured Senior Convertible Note Capital Ventures International Maximum	Nov. 15, 2013 Senior Secured Loan	Jun. 30, 2014 Senior Secured Loan	Jun. 30, 2014 Senior Secured Loan Maximum	Nov. 15, 2013 Senior Secured Loan Hercules Technology Growth Capital	Jun. 05, 2012 Senior Secured Loan Hercules Technology Growth Capital	Jun. 05, 2012 Senior Secured Loan Hercules Technology Growth Capital	Jun. 30, 2014 Senior Secured Loan Hercules Technology Growth Capital	Dec. 31, 2013 Senior Secured Loan Hercules Technology Growth Capital
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock														3,094,060								256,410			256,410	139,276	139,276
Warrant exercise, waiting period												6 months
Warrant exercise period												5 years
Exercise price													$ 2.61	$ 5.45	$ 2.57							$ 1.95	$ 1.94		$ 1.95	$ 3.59	$ 3.59	$ 1.94	$ 1.95
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			$ (35)	$ 469		$ 0	$ 0	$ 0		$ (100)	$ 400													$ (100)
Conversion price														$ 4.85			$ 3.10	$ 3.19	$ 4.85
Debt conversion, shares issued									6,600,000							6,600,000
Convertible debt instrument redemption waiting period					1 year
Convertible debt instrument contractual term					30 months
Warrants expiration date	May 15, 2019	Dec. 05, 2017

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Exercise price of the warrants.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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