Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 05, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining performance obligation	$ 1,400,000
Revenue recognized	2,643,425	$ 2,664,371
Capitalized contract costs	400,000
Exercise price of warrants			$ 0.28		$ 0.70
Revenues	6,971,632	$ 6,977,672
Accounting Standards Update 2014-09 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect on accumulated deficit				$ 300,000
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect on income	$ 100,000
Stock Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, requisite service period	4 years
Options and stock appreciation rights outstanding	1,236,445			413,301
Weighted average exercise price	$ 3.27			$ 9.04
Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issuable upon exercise	2,949,314
Exercise price of warrants	$ 2.32
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares	573,451			680,363
Stock Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anti-dilutive common shares excluded from the computation of diluted earnings per share	1,236,445	665,477
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anti-dilutive common shares excluded from the computation of diluted earnings per share	280,560	671,929
Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anti-dilutive common shares excluded from the computation of diluted earnings per share	1,077,255	38,887,708
Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issuable upon exercise	40,081,485
Systems [Member] | Revenue from Contract with Customer [Member] | Customer Concentration Risk [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenues percentage	1.00%	3.00%
Disposables [Member] | Revenue from Contract with Customer [Member] | Customer Concentration Risk [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenues percentage	37.00%	40.00%
Royalty [Member] | Revenue from Contract with Customer [Member] | Customer Concentration Risk [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenues percentage	10.00%	11.00%
Other Recurring Revenue [Member] | Revenue from Contract with Customer [Member] | Customer Concentration Risk [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenues percentage	53.00%	46.00%