Pursuant to Rule 424(b)(5)
information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to
these securities has been filed with the Securities and Exchange Commission and is effective. This preliminary prospectus supplement
and the accompanying prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities
in any jurisdiction where the offer or sale is not permitted.
TO COMPLETION, DATED FEBRUARY 7, 2019
Prospectus dated October 2, 2017)
are offering shares of our common stock.
common stock is listed on the NYSE American under the symbol “OCX.” The last reported sale price of our common stock
on February 6, 2019 was $4.52 per share.
are an “emerging growth company” as that term is used in the Jumpstart Our Business Startups Act of 2012, or the JOBS
Act, and, as such, have elected to comply with certain reduced public company reporting requirements for this prospectus supplement,
the accompanying prospectus and our filings with the Securities and Exchange Commission.
in our securities involves a high degree of risk. See “Risk Factors” beginning on page S-6 of this prospectus supplement,
as well as the documents incorporated by reference in this prospectus supplement, for a discussion of the factors you should carefully
consider before deciding to purchase our common stock.
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.
|Public offering price||
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discounts and commissions (1)||
|Proceeds, before expenses,
“Underwriting” beginning on page S-20 of this prospectus supplement for additional information regarding underwriting
have granted the underwriters an option for a period of 30 days to purchase up to an additional shares
of common stock at the public offering price.
underwriter expects to deliver the shares of common stock on or about ,
Janney Montgomery Scott
Supplement dated , 2019