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Convertible Preferred Stock	9 Months Ended
Convertible Preferred Stock	Sep. 30, 2013
Equity [Abstract]
Convertible Preferred Stock	4. Convertible Preferred Stock Each share of Preferred Stock was automatically converted into a fully paid share of Common Stock immediately prior to the closing of the IPO. Upon the occurrence of this conversion event, the outstanding warrant to purchase Series B convertible preferred stock converted into a warrant to purchase Common Stock. All of the outstanding shares of Preferred Stock converted into Common Stock at the conversion rate of 1:1.