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 21, 2017

IBEX INVESTORS LLC

By: /s/ Justin B. Borus

Name: Justin B. Borus

Title:  Manager 

/s/ Justin B. Borus

Justin B. Borus

IBEX MICROCAP FUND LLLP

By: Ibex Investors LLC

       its general partner

By: /s/ Justin B. Borus

Name: Justin B. Borus

Title:  Manager 

LAZARUS MACRO MICRO PARTNERS LLLP

By: Ibex Investors LLC

       its general partner

By: /s/ Justin B. Borus

Name: Justin B. Borus

Title:  Manager