Summary of Significant Accounting Policies - Share-based Compensation and Self-insurance Liabilities (Details)	9 Months Ended
Sep. 30, 2019 USD ($)
Accounting Policies [Abstract]
Maximum contractual term of share-based grants	10 years
Stop-loss limit per employee, per year, for self-insured employee medical claims	$ 150,000
Self-insurance liability	$ 500,000

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration