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Stock-Based Compensation - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - On the settlement of employee stock purchase plan shares - USD ($)	12 Months Ended
	Dec. 31, 2018	Apr. 30, 2017
Stock-Based Compensation
Maximum annual contribution per employee	$ 25,000
Maximum annual contribution per employee, percent	10.00%
Maximum number of shares available under the Plan		1,000,000
Non-vested awards at the end of the period (in shares)	871,203
Purchase discount rate	5.00%
Minimum
Stock-Based Compensation
Percentage discount on per share fair market value of shares	85.00%
Maximum
Stock-Based Compensation
Percentage discount on per share fair market value of shares	100.00%

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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 (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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