Revenue Recognition (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue from Contract with Customer [Line Items]
Product warranty term			1 year
Unbilled revenue, billed and collected, term			1 year
Accounts receivable, net	$ 6,085,000		$ 6,085,000		$ 3,966,000
Accounts receivable associated with revenue	3,700,000		3,700,000
Receivable under IBAS Award	2,400,000		2,400,000
Revenue recognized related to contract liabilities	$ 3,000	$ 0	$ 33,000	$ 38,000
Minimum [Member]
Revenue from Contract with Customer [Line Items]
Payment term			30 days
Maximum [Member]
Revenue from Contract with Customer [Line Items]
Payment term			60 days