Assets Held for Sale (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 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		$ 1,240,000	$ 965,000
Disposal Group, Including Discontinued Operation, Unclassified Balance Sheet Disclosures [Abstract]
Total liabilities	$ 511,000	511,000		$ 0
SureCheck | Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expenses related to expected sale, held-for-sale		1,576,000
Expenses related to expected sale, decrease in inventory reserves		798,000
Expense related to expected sale, impairment of intangible assets		778,000
Adjustment related to sale	207,000
Adjustment related to sale, inventory reserve	217,000
Adjustment related to sale, impairment of intangible assets	(10,000)
Disposal Group, Including Discontinued Operation, Unclassified Balance Sheet Disclosures [Abstract]
Accounts receivable - net	282,000	282,000
Intangible assets	2,118,000	2,118,000
Inventories - net	950,000	950,000
Total assets	3,350,000	3,350,000
Deferred revenue	393,000	393,000
Other liabilities	118,000	118,000
Total liabilities	$ 511,000	$ 511,000