| CUSIP No. 00434H108 | Page 10 of 11 |
Exhibit A
AGREEMENT REGARDING THE JOINT FILING OF
SCHEDULE 13D
The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13D to evidence the agreement of the below-named parties, in accordance with the rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule jointly on behalf of each such party.
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Date: May 26, 2015
| POLARIS VENTURE PARTNERS IV, L.P. | ||
| By: Polaris Venture Management Co. IV, L.L.C. | ||
| By: | * | |
| Managing Member | ||
| POLARIS VENTURE PARTNERS ENTREPRENEURS’ FUND IV, L.P. | ||
| By: Polaris Venture Management Co. IV, L.L.C. | ||
| By: | * | |
| Managing Member | ||
| POLARIS VENTURE MANAGEMENT CO. IV, L.L.C. | ||
| By: | * | |
| Managing Member | ||
| JONATHAN A. FLINT | ||
| By: | /s/ Jonathan A. Flint | |
| Jonathan A. Flint | ||
| CUSIP No. 00434H108 | Page 11 of 11 |
| TERRANCE G. MCGUIRE | ||
| By: | /s/ Terrance G. McGuire | |
| Terrance G. McGuire | ||
| ALAN G. SPOON | ||
| By: | /s/ Alan G. Spoon | |
| Alan G. Spoon | ||
| *By: | /s/ John Gannon | |
| Name: | John Gannon | |
| Attorney-in-Fact |
[This Schedule 13D was executed pursuant to a Power of Attorney. Note that copies of the applicable Powers of Attorney are already on file with the appropriate agencies.]