EXHIBIT A

JOINT FILING UNDERTAKING

The undersigned, being authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13G to evidence the agreement of the below-named parties, in accordance with rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule, as it may be amended, jointly on behalf of each of such parties.

Dated: June 11, 2021

TOPLINE CAPITAL MANAGEMENT, LLC
By:	/s/ Collin McBirney
	Collin McBirney
	Managing Member
TOPLINE CAPITAL PARTNERS, LP
By:	Topline Capital Management, LLC, its general partner
By:	/s/ Collin McBirney
	Collin McBirney
	Managing Member
COLLIN MCBIRNEY
/s/ Collin McBirney