Summary of Significant Accounting Policies - Investment in Unconsolidated Affiliate (Details) - VestaCare, Inc. - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Percentage of equity method investment		15.00%	15.00%
Payments to acquire equity method investments	$ 2.5	$ 2.5
VestaCare, Inc.
Schedule of Equity Method Investments [Line Items]
Voting interest		3.00%

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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