Inventories (Schedule of Inventory Reserve) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory Valuation Reserves [Roll Forward]
Balance, beginning of year	$ 2,117	$ 368	$ 50
Charged to provisions	5,659	2,418	388
Deductions for disposals	(2,078)	(669)	(70)
Balance, end of the year	$ 5,698	$ 2,117	$ 368