POWER OF ATTORNEY

     Know all by these present, that the undersigned does hereby constitute and
     appoint Matthias Schroff, Elias Papadimas, John Harrington, Jonathan Park,
     Samuel Toth, Brittany Stevenson, Caroline Mills and Michael Mosholder, and
     each of them, as the undersigned's true and lawful attorneys-in-fact and
     agents to do any and all things, and execute any or all instruments which,
     after the advice of counsel, said attorneys and agents may deem necessary
     and advisable to enable the undersigned to comply with the Securities
     Exchange Act of 1934, as amended, and any rules, regulations and
     requirements of the Securities and Exchange Commission ("SEC"), including
     specifically, but without limitation thereof, power of attorney to sign the
     undersigned's name to a Form ID, Form 144, Form 3, Form 4, Form 5, Schedule
     13D or Schedule 13G and any amendments thereto, to be filed with the SEC;
     and the undersigned does hereby ratify and confirm all that any of said
     attorneys and agents shall do or cause to be done by virtue hereof. The
     undersigned may revoke the authority granted herein upon delivering a
     signed written notice to the foregoing attorneys-in-fact.

     Executed on this 6th day of February, 2023.

     /s/ Jiyoung Hwang
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     Name: Jiyoung Hwang