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Mandatorily Redeemable Convertible Preferred Stock
12 Months Ended
Dec. 31, 2014
Text Block [Abstract]  
Mandatorily Redeemable Convertible Preferred Stock
10. Mandatorily redeemable convertible preferred stock

Pursuant to the Fourth Amended Certificate of Incorporation, the Company authorized preferred stock consisting of 40,000,000 shares of preferred stock, par value $0.001 per share. As of December 31, 2014, 2013 and 2012, the Company has no preferred stock subscribed and or issued.