Assets Held for Sale (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expenses related to expected sale, decrease in inventory reserves	$ (522)	$ 974
SureCheck | Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held-For-Sale Related Expenses	1,369
Expenses related to expected sale, decrease in inventory reserves	581
Expense related to expected sale, impairment of intangible assets	788
Accounts receivable - net	220
Intangible assets	2,180
Inventories - net	950
Total assets	3,350
Deferred revenue	726
Other liabilities	147
Total liabilities	873
Total net assets	$ 2,477