Stock-Based Compensation (Details) - RSU's - 2013 Plan - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Jul. 12, 2017
Stock-based compensation
Restricted stock units outstanding		24,535
Unvested RSU's	2,675	9,880
Weighted average remaining contractual life (in years)	3 months 29 days
Aggregate Intrinsic Value	$ 1,633
Minimum
Stock-based compensation
Initial vesting period of remaining RSU's vesting in April 2019	3 years
Maximum
Stock-based compensation
Initial vesting period of remaining RSU's vesting in April 2019	4 years

No definition available.

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- Definition

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

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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No definition available.

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- Definition

Represents the unvested RSU's which will vest by 2019.

+ References

No definition available.

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