Financial Instruments - Summary of Outstanding Interest Rate Swaps (Details) - Interest rate swaps - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Other current liability
Derivatives, Fair Value [Line Items]
Notional amount, liability	$ 20,000,000	$ 10,000,000
Fair value, liability	(211,000)	(13,000)
Other non-current liabilities
Derivatives, Fair Value [Line Items]
Notional amount, liability	65,000,000	85,000,000
Fair value, liability	$ (575,000)	$ (2,552,000)

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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