Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table summarizes net sales by end market:

(in thousands)	For the Year Ended December 31,
End Market	2021		2020
Power Systems	$	123,132	$	149,282
Industrial	153,289		131,026
Transportation	179,834		137,331
Total	$	456,255	$	417,639

The following table summarizes net sales by geographic area:

(in thousands)	For the Year Ended December 31,
Geographic Area	2021		2020
United States	$	406,077	$	366,445
North America	8,616		9,831
Pacific Rim	25,457		25,869
Europe	7,457		9,339
Other	8,648		6,155
Total	$	456,255	$	417,639

Schedule of Contract Balances

(in thousands)	As of December 31,
	2021		2020
Short-term contract assets (included in Prepaid expenses and other current assets)	$	2,707	$	547
Short-term contract liabilities (included in Other accrued liabilities)	(1,819)		(47,960)
Long-term contract liabilities (included in Noncurrent contract liabilities)	(3,330)		(3,181)
Net contract liabilities	$	(2,442)	$	(50,594)