Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,971	$ 7,837
Accumulated Amortization	(4,732)	(4,352)
Net Carrying Value	$ 3,239	$ 3,485
Weighted Average Useful Life	7 years 1 month 6 days	8 years
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,900	$ 3,900
Accumulated Amortization	(3,900)	(3,900)
Net Carrying Value	0	0
Vision development costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,929	2,929
Accumulated Amortization	(727)	(452)
Net Carrying Value	$ 2,202	$ 2,477
Weighted Average Useful Life	8 years	8 years
Software development in process costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 446	$ 1,008
Accumulated Amortization	0	0
Net Carrying Value	446	$ 1,008
IntellitraffiQ development costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	468
Accumulated Amortization	(29)
Net Carrying Value	$ 439
Weighted Average Useful Life	4 years
Wrong Way development costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 228
Accumulated Amortization	(76)
Net Carrying Value	$ 152
Weighted Average Useful Life	2 years