Quarterly report pursuant to Section 13 or 15(d)

Balance Sheets Details (Details Textual)

v2.4.0.6
Balance Sheets Details (Details Textual) (USD $)
Mar. 31, 2013
Securities
Dec. 31, 2012
Securities
Mar. 31, 2012
Dec. 31, 2011
Balance Sheets Details [Abstract]        
Cash and cash equivalents $ 31,231,000 $ 32,003,000 $ 26,604,000 $ 25,762,000
Money market funds 17,900,000 24,800,000    
Cash with major financial institutions $ 13,300,000 $ 7,200,000    
Marketable securities 0 0