Balance Sheet Components (Narrative) (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Provisions for excess and obsolete inventory	$ 3,877,000	$ 7,872,000	$ 3,878,000
Amortization expense	2,000,000.0	6,200,000	7,000,000.0
Intangible assets impairment charges	0	$ 0	$ 0
Equity securities without readily determinable fair value, cumulative downward adjustments for price change and impairment loss	8,400,000
Cumulative upward adjustments for price changes	$ 400,000

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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Amount of cumulative impairment loss on investment in equity security without readily determinable fair value.

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Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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