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Debt (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Apr. 04, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 05, 2012
Hercules Technology Growth Capital [Member]
Sep. 30, 2012
Hercules Technology Growth Capital [Member]
Sep. 30, 2012
Hercules Technology Growth Capital [Member]
Apr. 03, 2012
Capital Ventures International [Member]
Apr. 04, 2012
Capital Ventures International [Member]
Sep. 30, 2012
Capital Ventures International [Member]
Sep. 30, 2012
Capital Ventures International [Member]
Debt Instrument [Line Items]                        
Private placement                   $ 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%    
Conversion price                 $ 4.85      
Fair value of conversion feature                   3,800,000    
Legal and origination costs               300,000     1,800,000  
Total debt discount being amortized into interest expense             1,200,000 1,200,000     12,600,000 12,600,000
Interest income (expense), net   (2,919,000) 2,000 (5,637,000) 243,000              
Non-cash interest expense   2,300,000   4,443,000     200,000 300,000     2,100,000 4,200,000
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           400,000       7,000,000    
Strike price per share           $ 3.59       $ 5.45    
Aggregate principal amount of convertible notes and warrants   15,000,000   15,000,000                
Borrowed amount           10,000,000            
Proceeds from Issuance of Debt           9,700,000            
Covenant, unrestricted cash balance requirement             10,000,000 10,000,000        
Defered installment payment               $ 1,100,000        
Period before first installment payment 4 months