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: December 19, 2019
| 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 | ||