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Defined Contribution Plans
12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Defined Contribution Plans
Defined Contribution Plans
The Company has defined contribution plans for the benefit of its employees meeting certain eligibility requirements. Under the plans, participants may choose from various investment options and can contribute an amount of their eligible compensation annually as defined by the applicable plan documents, subject to IRS limitations. The Company contributed $0.1 million to these plans in each of 2017, 2016, 2015 and 2014. Subsequent to December 31, 2017, the Company merged its defined contribution plans into a single plan, sponsored by the Company, with the final merger effective December 1, 2018.