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Stockholders' Equity And Stock-Based Compensation (Summary Of Non-Cash Stock-Based Compensation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock-Based Compensation [Line Items]
Share-Based Compensation Expense	$ 4,334	$ 3,457	$ 3,761
Research And Development [Member]
Stock-Based Compensation [Line Items]
Share-Based Compensation Expense	1,751	1,198	1,624
General And Administrative [Member]
Stock-Based Compensation [Line Items]
Share-Based Compensation Expense	2,583	2,259	2,137
Employee Stock Options [Member]
Stock-Based Compensation [Line Items]
Share-Based Compensation Expense	3,492	3,457	3,761
Employee Stock Options [Member] | Research And Development [Member]
Stock-Based Compensation [Line Items]
Share-Based Compensation Expense	1,313	1,198	1,624
Employee Stock Options [Member] | General And Administrative [Member]
Stock-Based Compensation [Line Items]
Share-Based Compensation Expense	2,179	$ 2,259	$ 2,137
Performance Awards [Member]
Stock-Based Compensation [Line Items]
Share-Based Compensation Expense	842
Performance Awards [Member] | Research And Development [Member]
Stock-Based Compensation [Line Items]
Share-Based Compensation Expense	438
Performance Awards [Member] | General And Administrative [Member]
Stock-Based Compensation [Line Items]
Share-Based Compensation Expense	$ 404

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- Definition

Stock-Based Compensation [Line Items]

+ References

No definition available.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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