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401(k) Plan	12 Months Ended
401(k) Plan	Dec. 31, 2017
Retirement Benefits [Abstract]
401(k) Plan	401(k) Plan The Company maintains a 401(k) plan covering all eligible employees and provides for a Company match on a portion of eligible compensation. Employees may contribute up to 92% of their eligible compensation, subject to IRS maximums. The Company matches 25% of the first 4% of eligible compensation. The Company’s matching contributions are made in cash and amounted to $0.6 million, $0.5 million and $0.4 million for the years ended December 31, 2017, 2016 and 2015, respectively.