Assets - Assets held for sale (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Asset held for sale
Assets Held for Sale
Impairment			$ 4,000
Assets sold
Assets Held for Sale
Consideration	$ 11,400	$ 11,400
Transaction price due upon closing (as a percent)	85.00%
Amount held in escrow (as a percent)	15.00%
Period over which portion of transaction price is held in escrow	18 months
Impairment	$ 300	300
Major classes of assets classified as held for sale
Inventories	6,311	6,311
Property, plant, and equipment, net	372	372
Intangible assets, net	6,546	6,546
Goodwill	2,359	2,359
Deferred revenue	(59)	(59)
Total net assets sold	15,529	15,529
Net proceeds after costs to sell	$ (11,228)	(11,228)
Total loss on sale of disposal group		$ 4,301