Share-Based Compensation (Narrative) (Details)	6 Months Ended
Jun. 30, 2019 USD ($)
Employee Stock Options
Unrecognized compensation cost related to share-based compensation	$ 1,200,000
Weighted-average service period, years	2 years 36 days
Restricted Stock Rights
Unrecognized compensation cost related to share-based compensation	$ 465,000
Weighted-average service period, years	1 year 288 days
PSU
Unrecognized compensation cost related to share-based compensation	$ 19,000
Weighted-average service period, years	2 years 72 days

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration