Equity
 9 Months Ended
Sep. 30, 2013
Equity [Abstract]  
Equity
Equity
Common Stock — Effective on February 15, 2012, the Company’s board of directors and stockholders approved the Fifth Amended and Restated Certificate of Incorporation. The total number of common shares that the Company is authorized to issue is 100 million with a par value of $0.01 per share.
Preferred Stock — Effective on February 15, 2012, the Company’s board of directors and stockholders approved the Fifth Amended and Restated Certificate of Incorporation. The total number of preferred shares that the Company is authorized to issue is 10 million with a par value of $0.01 per share. None have been issued to date.
Conversion — Prior to the Company's initial public offering, each share of Series A, A-1, B, and C preferred stock was convertible at the option of the holder at any time into common stock. The conversion rate was the quotient obtained by dividing the original issue price of the Series A, A-1, B, or C by the conversion price. Subsequent to the Second Certificate of Amendment to the Fourth Amended and Restated Certificate of Incorporation, the conversion price was adjusted to effect a conversion of one preferred share into one and one-half common shares, as explained in Note 1, The Company and Summary of Significant Accounting Policies. The conversion price was subject to adjustment as set forth in the Restated Certificate of Incorporation for certain dilutive issuances, splits, and combinations, as therein defined. Conversion was automatic upon either the consent of the holders of 66% of the outstanding shares of preferred stock or the effective date of a firm commitment underwritten public offering of the Company’s common stock in which the post-offering valuation on a fully diluted basis was at least $150 million and the proceeds were not less than $25 million. All shares of the Company’s outstanding preferred stock were converted into common stock in February 2012 in connection with the Company’s initial public offering.