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Defined Contribution Plans | 12 Months Ended
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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.

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- Definition The entire disclosure of an entity's employee compensation and benefit plans, excluding share-based compensation and including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 + Details
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