| Date | Name | Title | Type | Security | Shares | Price | Value | Ownership | Reported |
| 02/11/2015 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Sale | Common Stock, $0.001 par value ("Common Stock") | 450k | $8.88 | $4M | See FN | 02/11/2015 |
| 01/07/2015 | WILSON DOW R | Director | Disposition | Stock Option (right to buy) | 15k | $1.30 | $19.5k | | 01/07/2015 |
| 01/07/2015 | WILSON DOW R | Director | Grant | Stock Option (right to buy) | 15k | $1.30 | $19.5k | | 01/07/2015 |
| 01/07/2015 | WILLIAMS PETER E III | SEE REMARKS | Grant | Stock Option (right to buy) | 50k | $1.30 | $65k | | 01/07/2015 |
| 01/07/2015 | WILLIAMS PETER E III | SEE REMARKS | Disposition | Stock Option (right to buy) | 50k | $1.30 | $65k | | 01/07/2015 |
| 12/18/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 35k | $8.85 | $309.8k | See footnotes | 12/16/2014 |
| 12/17/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 10k | $8.90 | $89k | See footnotes | 12/16/2014 |
| 12/16/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 20k | $9.40 | $188k | See footnotes | 12/16/2014 |
| 11/04/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 5k | $13.38 | $66.9k | See footnotes | 10/31/2014 |
| 10/31/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 10k | $13.44 | $134.4k | See footnotes | 10/31/2014 |
| 10/23/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 40k | $13.40 | $536k | See footnotes | 10/22/2014 |
| 10/22/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 40.6k | $13.18 | $534.6k | See footnotes | 10/22/2014 |
| 10/14/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 40k | $13.35 | $534k | See footnotes | 10/09/2014 |
| 10/10/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 80k | $13.37 | $1.1M | See footnotes | 10/09/2014 |
| 10/09/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 39.1k | $13.34 | $521.6k | See footnotes | 10/09/2014 |
| 09/24/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Sale | Common Stock, $0.001 par value ("Common Stock") | 25k | $13.07 | $326.9k | See FN | 09/24/2014 |
| 09/03/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 50k | $13.80 | $690k | See FN | 09/03/2014 |
| 08/26/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 22.5k | $14.31 | $322k | See FN | 08/26/2014 |
| 08/25/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Purchase | Common Stock | 6.1k | $13.78 | $84.1k | See FN | 08/21/2014 |
| 08/22/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Purchase | Common Stock | 5k | $13.84 | $69.2k | See FN | 08/21/2014 |
| 08/21/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 800 | $13.50 | $10.8k | See FN | 08/21/2014 |
| 08/20/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Purchase | Common Stock | 10k | $13.07 | $130.7k | See FN | 08/18/2014 |
| 08/18/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 15.6k | $12.35 | $192.7k | See FN | 08/18/2014 |
| 07/14/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Sale | Common Stock, $0.001 par value ("Common Stock") | 3.2k | $12.50 | $40.2k | See FN | 07/14/2014 |
| 06/05/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 9.6k | $10.16 | $97.5k | See footnotes | 06/04/2014 |
| 06/04/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 18k | $10.00 | $180k | See footnotes | 06/04/2014 |
| 05/30/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 5k | $9.78 | $48.9k | See footnotes | 05/28/2014 |
| 05/29/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 10.1k | $9.60 | $97k | See footnotes | 05/28/2014 |
| 05/28/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 100 | $9.40 | $940 | See footnotes | 05/28/2014 |
| 05/23/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 5.9k | $9.40 | $55.5k | See footnotes | 05/21/2014 |
| 05/21/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 25k | $9.50 | $237.5k | See footnotes | 05/21/2014 |
| 05/16/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock | 50k | $9.60 | $480k | See footnotes | 05/15/2014 |
| 05/15/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Sale | Common Stock, $0.001 par value ("Common Stock") | 32.2k | $9.90 | $318.8k | See FN | 05/15/2014 |
| 05/15/2014 | Emancipation Management LLC | 10% Owner | Purchase | Common Stock, $0.001 par value ("Common Stock") | 50k | $9.90 | $495k | See footnotes | 05/15/2014 |
| 05/09/2014 | ARDSLEY ADVISORY PARTNERS LP | 10% Owner | Sale | Common Stock, $0.001 par value ("Common Stock") | 25k | $9.60 | $240k | See FN | 05/09/2014 |
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