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Leases And Commitments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Leases And Commitments [Line Items]
Office space | ft²	6,000
Rent expense	$ 0.1	$ 0.1	$ 0.1
Austin, TX [Member]
Leases And Commitments [Line Items]
Operating lease expiration year	2017-12
Future minimum lease payments in 2017	$ 0.1

X

- Definition

Leases And Commitments [Line Items]

+ References

No definition available.

+ Details

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X

- Definition

Operating lease expiration year.

+ References

No definition available.

+ Details

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X

- Definition

Amount of minimum lease payments for capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

+ Details

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X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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X

- Definition

Net rentable area for properties owned.

+ References

No definition available.

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