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Selected Quarterly Financial Data (Schedule Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Results:
Revenue	$ 46,062	$ 42,150	$ 45,231	$ 41,273	$ 41,157	$ 38,340	$ 39,672	$ 35,940	$ 174,716	$ 155,109	$ 129,755
Gross profit	32,683	30,918	32,554	30,008	28,897	27,472	28,818	25,914	126,163	111,101	92,875
Loss from operations	(2,135)	(6,847)	(6,355)	(9,642)	(7,695)	(6,286)	(7,738)	(9,419)	(24,979)	(31,138)	(26,720)
Net loss	$ (2,580)	$ (7,246)	$ (6,883)	$ (10,183)	$ (8,625)	$ (6,783)	$ (8,206)	$ (9,724)	$ (26,892)	$ (33,338)	$ (27,212)
Net loss per share (basic and diluted)	$ (0.08)	$ (0.22)	$ (0.21)	$ (0.32)	$ (0.27)	$ (0.21)	$ (0.26)	$ (0.31)

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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