Restricted Cash	12 Months Ended
Dec. 31, 2019
Receivables [Abstract]
Restricted Cash	4. Restricted Cash When the Company entered the lease for its corporate headquarters, the Company’s bank, Avidbank, issued a $250,000 letter of credit to the lessor as security, which amount will be reduced by $50,000 on December 1 of each year beginning on December 1, 2019, 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 will be reduced as the amount required under the letter of credit is reduced. As of December 31, 2019, the letter of credit and the corresponding restricted cash recorded on the accompanying consolidated balance sheet was $200,000, with $50,000 plus any earned interest being recorded in short-term restricted cash and the balance being recorded in long-term restricted cash. The amount deposited in the restricted cash account does not count toward the covenant in the Avidbank loan and security agreement (see Note 13) that requires the Company to have an aggregate amount of unrestricted cash in deposit accounts or securities accounts maintained with Avidbank of not less than $2,000,000 at all times.

Restricted Cash

12 Months Ended

Dec. 31, 2019

4. Restricted Cash

When the Company entered the lease for its corporate headquarters, the Company’s bank, Avidbank, issued a $250,000 letter of credit to the lessor as security, which amount will be reduced by $50,000 on December 1 of each year beginning on December 1, 2019, 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 will be reduced as the amount required under the letter of credit is reduced. As of December 31, 2019, the letter of credit and the corresponding restricted cash recorded on the accompanying consolidated balance sheet was $200,000, with $50,000 plus any earned interest being recorded in short-term restricted cash and the balance being recorded in long-term restricted cash. The amount deposited in the restricted cash account does not count toward the covenant in the Avidbank loan and security agreement (see Note 13) that requires the Company to have an aggregate amount of unrestricted cash in deposit accounts or securities accounts maintained with Avidbank of not less than $2,000,000 at all times.