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401(k) Plan	12 Months Ended
401(k) Plan	Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]
401(k) Plan	18. 401(k) Plan The Company maintains a defined contribution 401(k) plan available to eligible employees. Employee contributions are voluntary and are determined on an individual basis, limited to the maximum amount allowable under federal tax regulations. The Company made matching contributions to the 401(k) plan totaling $424 thousand, $237 thousand and $57 thousand, for the years ended December 31, 2016, 2015 and 2014, respectively.