The Company has evaluated events and transactions subsequent to June 30, 2021 and through the date these condensed consolidated financial statements were included in this Quarterly Report on Form 10-Q and filed with the SEC.

On July 8, 2021, the Company entered into the Series D Amendment with Keystone pursuant to which Keystone agreed to purchase 22,077 shares of Series D Preferred Stock on or before July 9, 2021 at 5 p.m. Eastern Time for an aggregate purchase price of approximately $2.2 million. The Series D Amendment amended the Series D Preferred Stock Purchase Agreement dated August 31, 2020 between the parties. Prior to the Amendment Effective Date, Keystone had purchased 72,500 shares of Series D Preferred Stock pursuant to the Series D Preferred Stock Purchase Agreement, leaving a remaining balance of 77,500 shares of Series D Preferred Stock. After purchasing 22,077 of the remaining shares, Keystone has no further right or obligation to purchase shares of Series D Preferred Stock. The Series D Amendment also contains a customary mutual release provision.

The entire $2.2 million was received and the related 22,077 shares of Series D Preferred Stock were issued on July 8, 2021. In accordance with current accounting guidance, $2.2 million of stock subscriptions receivable was included in stock subscriptions and other receivables in the condensed consolidated balance sheet as of June 30, 2021. See Notes 2 and 12.