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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 | 6 Months Ended | 9 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended |  |  |  | 1 Months Ended | 0 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended
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Nov. 15, 2013 | Jun. 05, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2013 Convertible Bond | Sep. 30, 2013 Convertible Bond | Sep. 30, 2014 Senior Secured Term Loan First Warrant | Sep. 30, 2013 Senior Secured Term Loan First Warrant | Sep. 30, 2014 Senior Secured Term Loan First Warrant | Sep. 30, 2013 Senior Secured Term Loan First Warrant | Mar. 02, 2014 Capital Ventures International | Sep. 30, 2014 Capital Ventures International | Sep. 30, 2013 Capital Ventures International | Sep. 30, 2014 Capital Ventures International | Sep. 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 | Sep. 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 | Sep. 30, 2014 Senior Secured Loan | Sep. 30, 2014 Senior Secured Loan Maximum | Sep. 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 | Dec. 31, 2013 Senior Secured Loan Hercules Technology Growth Capital | Sep. 30, 2014 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 |  |
Warrant exercise, waiting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.61 | $ 5.45 | $ 2.55 |  |  |  |  |  |  | $ 1.95 | $ 1.94 |  |  | $ 1.95 | $ 3.59 | $ 1.95 | $ 1.94
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 |  |  | $ 795 | $ 886 | $ 760 | $ 1,355 |  | $ 300 | $ 300 | $ 0 | $ 0 | $ 0 | $ 0 |  | $ 800 | $ 500 | $ 700 | $ 900 |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 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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