EXHIBIT A JOINT FILING UNDERTAKING
Exhibit 99.1
EXHIBIT A
The undersigned, being authorized thereunto, hereby execute this agreement as an exhibit to this Amendment No. 1 to the 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: February 13, 2013 | WaldenVC, LLC | |||||
| By: | /s/ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ | |||||
| Name: ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ | ||||||
| Title: Managing Member | ||||||
| WaldenVC II, L.P. | ||||||
| By: | /s/ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ | |||||
| Name: ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ | ||||||
| Title: Managing Member | ||||||
| WaldenVC III, LLC | ||||||
| By: | /s/ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ | |||||
| Name: ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ | ||||||
| Title: Managing Member | ||||||
| WaldenVC SPK, LLC | ||||||
| By: | /s/ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ | |||||
| Name: ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ | ||||||
| Title: Managing Member | ||||||