Commitments and Contingencies	3 Months Ended
Mar. 31, 2021
Commitments and Contingencies
Commitments and Contingencies	20. Commitments and Contingencies Restricted Cash In connection with certain of the above noted sale/leaseback agreements, cash of $198.6 million was required to be restricted as security as of March 31, 2021, which restricted cash will be released over the lease term. As of March 31, 2021, the Company also had certain letters of credit backed by restricted cash totaling $144.4 million that are security for the above noted sale/leaseback agreements. Litigation Legal matters are defended and handled in the ordinary course of business. Liabilities for loss contingencies arising from claims, assessments, litigation, fines, and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred. The Company has not recorded any accruals related to any legal matters. Concentrations of Credit Risk Financial instruments that potentially subject the Company to credit risk consist principally of cash, cash equivalents, restricted cash, accounts receivable and marketable securities. Cash and restricted cash are maintained in accounts with financial institutions, which, at times may exceed the Federal depository insurance coverage of $0.25 million. The Company has not experienced losses on these accounts and management believes, based upon the quality of the financial institutions, that the credit risk with regard to these deposits is not significant. The Company’s available-for-sale securities consists primarily of investments in commercial paper and short-term high credit quality corporate debt securities. Concentrations of credit risk with respect to receivables exist due to the limited number of select customers with whom the Company has commercial sales arrangements. To mitigate credit risk, the Company performs appropriate evaluation of a prospective customer’s financial condition. At March 31, 2021, two customers comprised approximately 67.7% of the total accounts receivable balance. At December 31, 2020, three customers comprised approximately 73.9% of the total accounts receivable balance. For the three months ended March 31, 2021, 71.2% of total consolidated revenues were associated primarily with three customers. For the three months ended March 31, 2020 65.9% of total consolidated revenues were associated primarily with two customers. For purposes of assigning a customer to a sale/leaseback transaction completed with a financial institution, the Company considers the end user of the assets to be the ultimate customer.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

20. Commitments and Contingencies

Restricted Cash

In connection with certain of the above noted sale/leaseback agreements, cash of $198.6 million was required to be restricted as security as of March 31, 2021, which restricted cash will be released over the lease term. As of March 31, 2021, the Company also had certain letters of credit backed by restricted cash totaling $144.4 million that are security for the above noted sale/leaseback agreements.

Litigation

Legal matters are defended and handled in the ordinary course of business. Liabilities for loss contingencies arising from claims, assessments, litigation, fines, and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred. The Company has not recorded any accruals related to any legal matters.

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to credit risk consist principally of cash, cash equivalents, restricted cash, accounts receivable and marketable securities. Cash and restricted cash are maintained in accounts with financial institutions, which, at times may exceed the Federal depository insurance coverage of $0.25 million. The Company has not experienced losses on these accounts and management believes, based upon the quality of the financial institutions, that the credit risk with regard to these deposits is not significant. The Company’s available-for-sale securities consists primarily of investments in commercial paper and short-term high credit quality corporate debt securities.

Concentrations of credit risk with respect to receivables exist due to the limited number of select customers with whom the Company has commercial sales arrangements. To mitigate credit risk, the Company performs appropriate evaluation of a prospective customer’s financial condition.

At March 31, 2021, two customers comprised approximately 67.7% of the total accounts receivable balance. At December 31, 2020, three customers comprised approximately 73.9% of the total accounts receivable balance.

For the three months ended March 31, 2021, 71.2% of total consolidated revenues were associated primarily with three customers. For the three months ended March 31, 2020 65.9% of total consolidated revenues were associated primarily with two customers. For purposes of assigning a customer to a sale/leaseback transaction completed with a financial institution, the Company considers the end user of the assets to be the ultimate customer.