Divestiture - Narrative (Details) - USD ($) $ in Thousands			9 Months Ended
	Jan. 02, 2020	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Oct. 01, 2020	Jan. 01, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill disposal			$ 14,230
Proceeds from sale of business			3,328	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | IC Axon
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price					$ 28,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Alternative Fuels Division
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price						$ 4,800
Additional consideration upon achievement of milestone						500
Goodwill disposal						2,600
Proceeds from sale of business	$ 3,500	$ 1,500
Cash payment for settlement of net working capital	$ 200
Pre-tax gain on sale of the business			1,100
Selling costs			$ 1,300
Net working capital						$ 100
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Subsequent Event | IC Axon
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Escrow deposit					1,500
Additional consideration upon achievement of milestone					2,000
Goodwill disposal					14,200
Assets held for sale, intangible assets					7,000
Assets held for sale, accounts receivable					2,800
Liabilities held for sale, deferred tax					$ 1,900