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Commitments and Contingencies | 12 Months Ended
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Dec. 31, 2020
Commitments and Contingencies |
Commitments and Contingencies | 22. Commitments and Contingencies, as restated ​ Restricted Cash ​ In connection with certain of the above noted sale/leaseback agreements, cash of $169.0 million was required to be restricted as security as of December 31, 2020, which restricted cash will be released over the lease term. As of December 31, 2020, the Company also had certain letters of credit backed by security deposits totaling $152.4 million that are security for the above noted sale/leaseback agreements. ​ The Company also had letters of credit in the aggregate amount of $0.5 million at December 31, 2020 associated with a finance obligation from the sale/leaseback of its building. We consider cash collateralizing this letter of credit as restricted cash. ​ 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 ​ Concentrations of credit risk with respect to receivables exist due to the limited number of select customers with whom the Company has initial commercial sales arrangements. To mitigate credit risk, the Company performs appropriate evaluation of a prospective customer’s financial condition. ​ At December 31, 2020, three customers comprised approximately 73.9% of the total accounts receivable balance. At December 31, 2019, two customers comprised approximately 62.6% of the total accounts receivable balance. ​ On December 31, 2020, the Company waived the remaining vesting conditions under the Amazon Warrant, which resulted in a reduction in revenue of $399.7 million, which resulted in negative consolidated revenue of $93.2 million for the year ended December 31, 2020. See Note 18, “Warrant Transaction Agreements,” to the consolidated financial statements for further information. Total revenue in 2020 for this customer was negative $310.1 million. For the year ended December 31, 2020, this customer accounted for (332.4)% of our total consolidated revenues which included a provision for warrant charge of $420.0 million, which was recorded as a reduction of revenue. Additionally, 156.2% of our total consolidated revenues were associated primarily with two other customers. For the year ended December 31, 2019 49.7% of total consolidated revenues were associated primarily with two customers, as restated. For the year ended December 31, 2018 66.8% of total consolidated revenues were associated primarily with two customers, as restated. 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. At December 31, 2020, three customers comprised approximately 73.9% of the total accounts receivable balance. At December 31, 2019, two customers comprised approximately 62.6% of the total accounts receivable balance.

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