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Debt - Additional Information (Detail) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Apr. 30, 2013
New Unsecured Senior Convertible Note [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. 03, 2012
New Unsecured Senior Convertible Note [Member]
Capital Ventures International [Member]
Mar. 31, 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. 30, 2013
Senior Convertible Debt [Member]
Jun. 30, 2012
Senior Convertible Debt [Member]
Apr. 04, 2012
Senior Convertible Debt [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
Senior Convertible Debt [Member]
Capital Ventures International [Member]
Jun. 05, 2012
Senior Secured Term Loan [Member]
Hercules Technology Growth Capital [Member]
Jun. 30, 2013
Senior Secured Term Loan [Member]
Hercules Technology Growth Capital [Member]
Jun. 30, 2012
Senior Secured Term Loan [Member]
Hercules Technology Growth Capital [Member]
Mar. 31, 2013
Senior Secured Term Loan [Member]
Hercules Technology Growth Capital [Member]
Jun. 05, 2012
Senior Secured Term Loan [Member]
Hercules Technology Growth Capital [Member]
Minimum [Member]
Debt Instrument [Line Items]                                          
Interest rate percentage       7.00%                 7.00%                
Net proceeds after fees and expenses of purchase agreement                           $ 23,200,000              
Conversion price                 $ 3.19 $ 4.85         $ 4.85            
Premium over closing price, percentage                             20.00%            
Period before first installment payment                           4 months              
Shares registered for resale                           10,262,311              
Derivative liability of note 3,693,000   4,162,000   1,500,000                 3,800,000              
Number of shares received from warrants received to purchase common stock                           3,094,060     139,276        
Strike price per share                           $ 5.45     $ 3.59        
Fair value of warrants at issuance               25,000,000           7,000,000     400,000        
Legal and origination costs               1,800,000                       300,000  
Amendment covenant description         Allow the Company to convert, subject to the satisfaction of certain conditions set forth in the Exchanged Note, (a) at least $2.5 million of the approximately $5.3 million installment amount payable with respect to the January 2013 installment date (including approximately $4.2 million of deferred installment amounts from the period September 4, 2012 to December 3, 2012) into shares of the Company's common stock (on December 21, 2012 the Company converted $3.8 million in deferred installment amount principal and interest and issued 1,715,443 shares of common stock), and (b) the balance of the January 2013 installment amount in equal amounts on each of the February and March 2013 installment dates; Reduce the price failure equity condition with respect to a particular date of determination from $2.50 to $1.00;Reduce the aggregate daily dollar trading volume equity condition required for at least 25 of the 30 consecutive trading days immediately preceding a date of determination from $1,500,000 to $850,000 per trading day. In addition, if the aggregate daily dollar trading volume is between $50,000 and $850,000, the Company may still convert into common stock a portion of an installment amount payable with respect to an installment date equal to the quotient of (x) the aggregate daily dollar trading volume, divided by (y) $850,000;Increase CVI's beneficial ownership limitation under the Exchanged Note from 4.99% to 9.99%; andReduce the conversion price, from $4.85 per share of the Company's common stock to $3.19 per share of the Company's common stock, subject to certain price-based and other anti-dilution adjustments.                                
Portion of installment payment to be converted                 2,500,000                        
Installment amount of note payable         5,300,000                                
Deferred installment payments of note payable             4,200,000                            
Convertible amount of installment payment 1,832,000 1,016,000     3,800,000                                
Number of shares issued for converted payment         1,715,443                                
Price failure equity condition                 $ 1.00 $ 2.50                      
Aggregate daily dollar trading volume         850,000       50,000 850,000           1,500,000          
Minimum number of consecutive trading days for reducing daily dollar trading         25 days                                
Number of trading days immediately preceding date of determination         30 days                                
Beneficial ownership limitation percentage                 4.99% 9.99%                      
Increase in derivative liability         500,000 500,000                              
Total debt discount being amortized into interest expense         13,100,000                                
Non-cash interest expense amortization of debt discount 1,700,000 2,300,000                 1,500,000 2,200,000           100,000 100,000    
Percentage of stock discount 85.00%                                        
Non-cash interest expense issuing stock at discount 100,000                                        
Number of trading days for valuation of shares 10 days                                        
Borrowed amount                                 10,000,000        
Proceeds from the issuance of debt, net of expenses                                 9,700,000        
Interest rate on loan                                 11.00%        
Prime rate                                         3.75%
End of term fee                                       500,000  
Interest expense 2,100,000 2,700,000                                   1,200,000  
Covenant, unrestricted cash balance requirement                                   $ 10,000,000