Sale of MRI Assets - Schedule of Net Assets Sold (Detail) - Disposal Group, Held-for-sale, Not Discontinued Operations [Member] - VersaVue Software and DynaCAD Product and Related Assets [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Assets
Accounts Receivable	$ 116
Intangible assets	810
Allocated Goodwill	394
Total Assets	1,320
Liabilities
Deferred Revenue	746
Total Liabilities	746
Net Assets Sold	$ 574