Filed Pursuant to Rule 424(b)(5)
Registration No. 333-254261
AMENDMENT NO. 1
To Prospectus Supplement dated July 19, 2021
(to Prospectus dated May 5, 2021)

$60,000,000
Common Stock
This Amendment No. 1 to Prospectus Supplement, or this amendment, amends our prospectus supplement dated July 19, 2021, or the prospectus supplement. This amendment should be read in conjunction with the prospectus supplement dated July 19, 2021 and the accompanying prospectus dated May 5, 2021, each of which are to be delivered with this amendment. This amendment amends the information presented under the heading “Use of Proceeds” in the prospectus supplement; all other information in the prospectus supplement remains unchanged, except to the extent expressly described in this amendment.
We have entered into an At-The-Market Offering Agreement, or the ATM Agreement, with Craig-Hallum Capital Group LLC, or Craig-Hallum, relating to the sale of shares of our common stock, $0.01 par value per share, from time to time for an aggregate offering price of up to $60,000,000 through Craig-Hallum, as our agent. As of the date of this amendment, we have sold a total of 8,323,242 shares pursuant to the ATM Agreement for gross proceeds totaling $36,874,834.85 and may sell pursuant to the ATM Agreement additional shares of an aggregate offering price of up to $23,125,165.15.
Our common stock is traded on the Nasdaq Capital Market under the symbol “CEMI”. On August 6, 2021, the closing price of our common stock on the Nasdaq Capital Market was $3.01 per share.
Investing in our common stock involves a high degree of risk. See “Risk Factors” beginning on page S-0 of the prospectus supplement for a discussion of important factors you should carefully consider before making an investment decision.
Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities, or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.
Craig-Hallum
The date of this Amendment No. 1 to Prospectus Supplement is August 9, 2021.