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Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2017
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Follow-On Offerings On March 4, 2015, the Company and certain selling stockholders completed a follow-on offering of 5,122 shares of common stock at $19.75 per share, and sold an additional 768 shares of common stock at $19.75 per share when the underwriters exercised their over-allotment option to purchase additional shares. The total shares sold in the follow-on offering and shares sold when the underwriters exercised their over-allotment option included 4,133 shares sold by selling stockholders and 1,757 shares sold by the Company. After deducting the payment of underwriters' discounts and commissions and offering costs, the net proceeds to the Company from the sale of shares in the offering and the sale of shares when the underwriters exercised their over-allotment option was approximately $32.3 million. On September 30, 2015, the Company and certain selling stockholders completed a follow-on offering of 3,799 shares of common stock at $25.50 per share, and on October 15, 2015, selling stockholders sold an additional 570 shares of common stock at $25.50 per share when the underwriters exercised their over-allotment option to purchase additional shares. The total shares sold in the follow-on offering and shares sold when the underwriters exercised their over-allotment option included 3,516 shares sold by selling stockholders and 853 shares sold by the Company. After deducting the payment of underwriters' discounts and commissions and offering costs, the net proceeds to the Company from the sale of shares in the offering was approximately $20.3 million.