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Debt (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Oct. 04, 2012
Jun. 30, 2012
Apr. 04, 2012
Senior Convertible Note [Member]
Mar. 31, 2013
Senior Convertible Note [Member]
Apr. 30, 2012
New Unsecured Senior Convertible Note [Member]
Jun. 05, 2012
Senior Secured Term Loan [Member]
Apr. 04, 2012
Capital Ventures International [Member]
Senior Convertible Note [Member]
Apr. 04, 2010
Capital Ventures International [Member]
Senior Convertible Note [Member]
Dec. 31, 2012
Capital Ventures International [Member]
Senior Convertible Note [Member]
Dec. 31, 2012
Capital Ventures International [Member]
New Unsecured Senior Convertible Note [Member]
Dec. 03, 2012
Capital Ventures International [Member]
New Unsecured Senior Convertible Note [Member]
Jun. 05, 2012
Hercules Technology Growth Capital [Member]
Senior Secured Term Loan [Member]
Mar. 31, 2013
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]
Jun. 05, 2012
Minimum [Member]
Hercules Technology Growth Capital [Member]
Senior Secured Term Loan [Member]
Dec. 31, 2012
Maximum [Member]
Capital Ventures International [Member]
New Unsecured Senior Convertible Note [Member]
Debt Instrument [Line Items]                                      
Private placement         $ 35,000,000 $ 25,000,000     $ 10,000,000                    
Interest rate percentage           7.00%   7.00%                      
Net proceeds after fees and expenses of purchase agreement                   23,200,000                  
Conversion price                     $ 4.85           $ 3.19   $ 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 4,162,000                 3,800,000     1,500,000            
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                   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 18,896,000 720,000 842,000                   3,800,000            
Number of shares issued for converted payment                         1,715,443            
Price failure equity condition                                 $ 1.00   $ 2.50
Beneficial ownership limitation percentage                                 4.99%   9.99%
Increase in derivative liability                         500,000            
Total debt discount being amortized into interest expense                         13,100,000            
Non-cash interest expense amortization of debt discount 12,400,000           8,200,000                 600,000      
Percentage of stock discount 85.00%                                    
Non-cash interest expense issuing stock at discount 3,600,000                                    
Right to issue additional principal amount       15,000,000                              
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 14,900,000                             1,200,000      
Covenant, unrestricted cash balance requirement                               $ 10,000,000