Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Summary of Accounts Receivable

Year Ended December 31,	2020			2019
(Dollars in thousands)
Trade receivables	$	41,647		$	71,150
Other receivables		8,211			8,503
		49,858			79,653
Allowance for doubtful accounts		(863	)		(2,867	)
Accounts receivable, net	$	48,995		$	76,786

Schedule of Revenues by Major Customers

	2020 Percent of Sales			2019 Percent of Sales
GM		24	%		22	%
VW Group		16	%		13	%
Ford		11	%		15	%