Lease Obligations - Additional Information (Details) € in Thousands			3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Nov. 30, 2019 USD ($)	Nov. 30, 2019 USD ($)	Mar. 01, 2019 USD ($)	Feb. 28, 2019 USD ($)
Leases [Line Items]
Operating lease, right of use asset			$ 2,773,000	$ 2,773,000		$ 0
Lease liabilities			2,807,000	2,807,000
Short term leases			0	0
Gain related to execution of sale transaction			4,057,000	4,057,000
Rental income			176,000	$ 460,000
Selling Real Property in Pulheim, Germany to CLM S.A. RL [Member]
Leases [Line Items]
Sale leaseback transaction, selling price | €		€ 10,920
Net proceeds from sale leaseback transaction after transactional costs and repayment of outstanding mortgage	$ 9,500,000
Sale leaseback transaction transaction costs	270,000
Repayment of outstanding mortgage on the property	$ 2,104,000
Sale leaseback transaction initial lease term				5 years
Gain related to execution of sale transaction			$ 4,057,000	$ 4,057,000
Minimum [Member]
Leases [Line Items]
Operating and finance leases remaining lease terms				1 year
Maximum [Member]
Leases [Line Items]
Operating and finance leases remaining lease terms				7 years
ASU 2016-02 [Member]
Leases [Line Items]
Operating lease, right of use asset					$ 2,227,000
Lease liabilities					$ 2,243,000