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Convertible Preferred Stock	9 Months Ended
Convertible Preferred Stock	Sep. 30, 2013
Convertible Preferred Stock
Convertible Preferred Stock	6. Convertible Preferred Stock In June 2013, the Company amended its Amended and Restated Certificate of Incorporation to increase the number of authorized shares of Series C convertible preferred stock from 14,000,000 to 14,852,001 and amended the Series C stock purchase agreement to increase the number of shares that may be sold in additional closings from 26,455 to a total of 1,640,212. The Company completed the second closing and two additional closings under the agreement, and received gross proceeds of $13.0 million for the issuance of an aggregate of 6,904,761 shares of Series C convertible preferred stock.