The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Intangible Assets, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 2,867		$ 2,867		$ 2,867
Less: accumulated amortization	(2,842)		(2,842)		(2,816)
Intangible assets, net	25		25		51
Amortization expense	12	$ 12	25	$ 25
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Estimated annual amortization expense	25		25
Purchased technology-based intangible
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	2,358		2,358		2,358
Purchased patent
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 509		$ 509		$ 509