16.SUBSEQUENT EVENTS

The Company evaluated all events or transactions that occurred through the date which these consolidated financial statements were issued. On February 12, 2021, the Company announced that it had entered into a securities purchase agreement with certain institutional and accredited investors to raise approximately $6.9 million through the issuance of an aggregate of 43,125,004 shares of its common stock and warrants to purchase up to an aggregate of 32,343,753 shares of common stock, at a combined purchase price of $0.16 per share of common stock and associated warrant in a private placement (the “2021 Financing”). The Series K Warrants have an exercise price of $0.17 per share and are exercisable for a period of 5.5 years. The gross proceeds to Arch from the 2021 Financing, which is expected to close on February 17, 2021, are expected to be approximately $6.9 million before deducting financing costs of approximately $700,000.  

The Company engaged H.C. Wainwright & Co., LLC (the “Placement Agent) as exclusive placement agent for the 2021 Financing. Pursuant to the Company’s engagement letter with the Placement Agent, the Company also agreed to issue to the Placement Agent, or its designees, warrants to purchase up to 3,234,375 shares (the “Placement Agent 2 Warrants”). The Placement Agent 2 Warrants have substantially the same terms as the Series K Warrants, except that the exercise price of the Placement Agent Warrants is $0.20 per share.