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Debt (Details) (USD $)
 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Apr. 04, 2012
Jun. 30, 2012
Mar. 31, 2012
Jun. 05, 2012
Hercules Technology Growth Capital [Member]
Jun. 30, 2012
Hercules Technology Growth Capital [Member]
Apr. 04, 2012
Capital Ventures International [Member]
Apr. 03, 2012
Capital Ventures International [Member]
Jun. 30, 2012
Capital Ventures International [Member]
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    
Amount of additional convertible notes and warrants   15,000,000            
Legal and origination costs         300,000     1,800,000
Total debt discount being amortized into interest expense   2,800,000     1,200,000     12,600,000
Non-cash interest expense   2,282,000     100,000     2,200,000
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       139,000        
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            
Borrowed amount       10,000,000        
Proceeds from Issuance of Debt       9,700,000        
Adverse purchase commitments   $ 17,516,000 $ 25,894,000