Revenue From Contracts With Customers - Deferred Revenue (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Revenue, Remaining Performance Obligation [Roll Forward]
Deferred revenue at December 31, 2018	$ 7,710
Cash collected in excess of revenue recognized	3,984
Recognition of deferred revenue	(6,384)
Deferred revenue at September 30, 2019	5,310
New Venture
Revenue, Remaining Performance Obligation [Roll Forward]
Deferred revenue at December 31, 2018	5,797
Deferred revenue at September 30, 2019	1,973
Imaging Services
Revenue, Remaining Performance Obligation [Roll Forward]
Deferred revenue at December 31, 2018	307
Deferred revenue at September 30, 2019	1,219
Devices
Revenue, Remaining Performance Obligation [Roll Forward]
Deferred revenue at December 31, 2018	626
Deferred revenue at September 30, 2019	1,018
Optimization Software & Services
Revenue, Remaining Performance Obligation [Roll Forward]
Deferred revenue at December 31, 2018	980
Deferred revenue at September 30, 2019	$ 1,100