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Retirement Savings Plan	12 Months Ended
Retirement Savings Plan	Dec. 31, 2017
Retirement Savings Plan
Retirement Savings Plan	(16) Retirement Savings Plan The Company maintains a 401(k) Plan which is available to substantially all employees. Under the terms of the 401(k) Plan, participants may elect to contribute up to 60% of their compensation or the statutory prescribed limits. The Company may make 50% matching contributions on up to 4% of a participant's annual salary. Benefit expense for the 401(k) Plan was $0.5 million for the year ended December 31, 2017 and $0.4 million for each of the years ended December 31, 2016 and 2015.