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Restricted Cash	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Restricted Cash	7. Restricted Cash At the commencement date of the Company’s lease for its corporate headquarters on December 1, 2018, the Company’s primary lender, Avidbank, issued a $250,000 letter of credit to the lessor as security, which amount was reduced by $50,000 to $200,000 on December 1, 2019 and was to be reduced by the same amount December 1 of each year thereafter, provided there has been no default under the lease. Avidbank required the Company to deposit $250,000 in a restricted cash account maintained with the bank, which amount was and would be reduced as the amount required under the letter of credit is reduced. The Company recorded the $250,000 deposit as restricted cash on its balance sheet, with $50,000 plus any earned interest being recorded in short-term restricted cash and the balance being recorded in long-term restricted cash. In June 2020, the Company terminated its lease for its corporate headquarters, and as part of the consideration to the lessor for the early least termination, the lessor received the $200,000 of restricted cash provided for under the letter of credit in July 2020. (See Note 16 for more information on the lease termination.)

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- Definition

The entire disclosure for assets that are restricted in their use, generally by contractual agreements or regulatory requirements. This would include, but not limited to, a description of the restricted assets and the terms of the restriction.

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