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Follow-On Public Offering	9 Months Ended
Follow-On Public Offering	Sep. 30, 2015
Equity [Abstract]
Follow-On Public Offering	Follow-On Public Offering On January 16, 2014, the Company completed a follow-on public offering of 6,072,000 shares of its common stock. The Company sold 747,500 shares of its common stock, and the selling shareholders sold 5,324,500 shares in the offering, including the underwriters’ over-allotment, at a price to the public of $35.50 per share. The offering closed on January 23, 2014, and the Company received net proceeds of $24.8 million after deducting the underwriters discount and offering expenses, which have been included in additional paid-in-capital in the accompanying balance sheets as of September 30, 2015 and December 31, 2014.