Inventory (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 3,201,000		$ 3,201,000		$ 2,834,000
Work in progress	593,000		593,000		532,000
Finished goods	7,185,000		7,185,000		5,499,000
Total inventory	10,979,000		10,979,000		$ 8,865,000
Inventory impairment	0	$ 0	0	$ 40,000
Consigned inventory	$ 126,000		$ 126,000