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Balance Sheet Components (Paycheck Protection Program) (Narrative) (Details) - USD ($)		3 Months Ended	12 Months Ended
	Apr. 25, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Gain on loan extinguishment			$ 796,000	$ 0
Notes Payable to Banks | Paycheck Protection Program
Debt Instrument [Line Items]
Face amount of debt instrument	$ 796,000
Term of debt instrument	2 years
Stated interest rate (as a percent)	1.00%
Period until first payment	6 months
Gain on loan extinguishment		$ 796,000

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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