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Revenue Recognition (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
Revenue Recognition (Narrative) (Details) - USD ($)	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Deferred revenue	$ 2,184,000		$ 2,184,000		$ 2,122,000
Deferred revenue, net of current portion	5,402,000		5,402,000		6,149,000
License agreement
Recognition of ongoing per unit royalties	79,000	$ 57,000	732,000	$ 180,000
Recognition of prorated portion of deferred revenue	252,000	$ 252,000	750,000	$ 597,000
Deferred revenue	999,000		999,000		1,000,000
Deferred revenue, net of current portion	$ 5,400,000		$ 5,400,000		$ 6,100,000

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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