EXHIBIT 2
JOINT FILING AGREEMENT
The undersigned hereby agree to the joint filing of the Amendment No. 1 to Schedule 13D to which this Agreement is attached.
Dated: December 19, 2017
| DISCOVERY EQUITY PARTNERS, L.P. | ||
| By | Michael R. Murphy* | |
| Michael R. Murphy | ||
| Manager | ||
| DISCOVERY GROUP I, LLC | ||
| By | Michael R. Murphy * | |
| Michael R. Murphy | ||
| Manager | ||
| *By: | /s/ Mark Buckley | |
| Mark Buckley | ||
| Attorney-in-Fact for Michael R. Murphy | ||
