Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,351	$ 6,785
Accumulated Amortization	(4,170)	(3,990)
Net Carrying Value	$ 3,181	$ 2,795
Weighted Average Useful Life	8 years	8 years
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,900	$ 3,900
Accumulated Amortization	$ (3,900)	$ (3,900)
Weighted Average Useful Life	8 years	8 years
Vision development costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,885	$ 2,885
Accumulated Amortization	(270)	(90)
Net Carrying Value	2,615	$ 2,795
Software development costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	566
Accumulated Amortization	0
Net Carrying Value	$ 566