Leases - Narratives (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Aug. 31, 2021	Jul. 31, 2021 a	Dec. 31, 2020 USD ($)
Lessee, Lease, Description
Operating lease, right-of-use asset	$ 8,474,000		$ 8,474,000			$ 8,984,000
Operating lease liability	2,099,000		2,099,000			$ 2,320,000
Impairment of right-of-use assets	$ 0	$ 7,400,000	$ 0
Warehouse facility in Monahans, TX
Lessee, Lease, Description
Operating lease term				5 years
Property In Waller, TX | Land
Lessee, Lease, Description
Area of Land | a					15
Property In Waller, TX | Building
Lessee, Lease, Description
Area of property (sqft.) | a					38,000
Adjustment
Lessee, Lease, Description
Operating lease, right-of-use asset		6,200,000
Operating lease liability		$ 6,200,000