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Defined Contribution Plans	12 Months Ended
Defined Contribution Plans	Dec. 31, 2018
Retirement Benefits [Abstract]
Defined Contribution Plans	Defined Contribution Plans During 2017, the Company had two defined contribution plans for the benefit of its employees meeting certain eligibility requirements. Under the plans, participants could choose from various investment options and could contribute an amount of their eligible compensation annually as defined by the applicable plan documents, subject to Internal Revenue Service (“IRS”) limitations. The Company contributed $0.1 million to these plans in 2017. 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. As of December 31, 2018, the Company had not contributed to the plans and recorded a liability of $0.7 million for 2018 contributions.