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Debt (Details) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Apr. 04, 2012
Dec. 31, 2012
Dec. 31, 2012
Dec. 20, 2012
Apr. 04, 2012
Capital Ventures International [Member]
Dec. 31, 2012
Capital Ventures International [Member]
Dec. 31, 2012
Capital Ventures International [Member]
Apr. 03, 2012
Capital Ventures International [Member]
Unsecured Senior Convertible Note [Member]
Apr. 04, 2012
Capital Ventures International [Member]
Unsecured Senior Convertible Note [Member]
Dec. 31, 2012
Capital Ventures International [Member]
Unsecured Senior Convertible Note [Member]
Oct. 04, 2012
Capital Ventures International [Member]
Unsecured Senior Convertible Note [Member]
Dec. 31, 2012
Capital Ventures International [Member]
New Unsecured Senior Convertible Note [Member]
Jun. 05, 2012
Hercules Technology Growth Capital [Member]
Dec. 31, 2012
Hercules Technology Growth Capital [Member]
Dec. 31, 2012
Hercules Technology Growth Capital [Member]
Jun. 05, 2012
Hercules Technology Growth Capital [Member]
Senior Secured Term Loan [Member]
Dec. 31, 2012
Hercules Technology Growth Capital [Member]
Senior Secured Term Loan [Member]
Dec. 31, 2012
Hercules Technology Growth Capital [Member]
Senior Secured Term Loan [Member]
Dec. 31, 2012
Minimum [Member]
Capital Ventures International [Member]
New Unsecured Senior Convertible Note [Member]
Dec. 31, 2012
Maximum [Member]
Capital Ventures International [Member]
New Unsecured Senior Convertible Note [Member]
Debt Instrument [Line Items]                                        
Private placement         $ 25,000,000       $ 25,000,000                      
Net proceeds after fees and expenses of purchase agreement                 23,200,000                      
Shares registered for resale 10,262,311                                      
Percent of senior convertible notes         7.00%       7.00%                      
Conversion price               $ 4.85   $ 4.85   $ 3.19                
Derivative liability of note   5,605,000 5,605,000 1,500,000 3,800,000                              
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                       3,800,000                
Number of shares issued for converted payment                       1,715,443                
Price failure equity condition percentage                   $ 2.50   $ 1.00                
Aggregate daily dollar trading volume                   1,500,000   850,000             50,000 850,000
Beneficial ownership limitation percentage                   4.99%   9.99%                
Increase in derivative liability   500,000                                    
Non-cash interest expense amortization of debt discount           2,200,000 6,400,000             200,000 500,000   3,900,000 8,400,000    
Percentage of stock discount   85.00%                                    
Non-cash interest expense issuing stock at discount   1,500,000 1,500,000                                  
Right to issue additional principal amount                     15,000,000                  
Legal and origination costs                   1,800,000         300,000          
Total debt discount being amortized into interest expense           13,100,000 13,100,000         500,000   1,200,000 1,200,000          
End of term fee                             500,000          
Premium over closing price               20.00%                        
Value of warrants received to purchase common stock         3,100,000                              
Interest rate on loan                               11.00%        
Prime rate, minimum                               3.75%        
Number of shares received from warrants received to purchase common stock                         139,276              
Fair value of warrants at issuance         7,000,000               400,000              
Strike price per share         $ 5.45               $ 3.59              
Interest expense                                 4,600,000 10,300,000    
Borrowed amount                         10,000,000     10,000,000        
Proceeds from the issuance of debt, net of expenses                               9,700,000        
Covenant, unrestricted cash balance requirement                           $ 10,000,000 $ 10,000,000          
Period before first installment payment                 4 months