Quarterly report pursuant to Section 13 or 15(d)

Convertible Preferred Stock - Summary of Non-Redeemable Convertible Preferred Stock (Details)

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Convertible Preferred Stock - Summary of Non-Redeemable Convertible Preferred Stock (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Temporary Equity [Line Items]    
Shares authorized 100,000 100,000
Shares issued 0 66,666
Shares converted (66,666)  
Shares outstanding 0 66,666
Par value $ 0.001 $ 0.001
Conversion rate   1.01706
Liquidation preference per share   $ 3.750
Dividend rate   5.00%
Issue date   May 2002
Prior to IPO
   
Temporary Equity [Line Items]    
Shares issued 66,666