| Filing Date | Insider | Type | 10b5-1 | Net Shares | Ownership change | Avg. Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| 2019-04-15 | HAWLEY ROGER Director | Purchase | +454,545 | +92.69%944,956 | $1.10 | $500,000 | View SEC filing | |
| 2018-06-12 | HAWLEY ROGER Director | Purchase | +140,000 | +100.00%140,000 | $1.45 | $203,378 | View SEC filing | |
| 2016-02-23 | WALT DAVID R Director | Purchase | +2,291 | +1.39%167,491 | $2.08 | $4,763 | View SEC filing | |
| 2016-02-19 | WALT DAVID R Director | Purchase | +8,960 | +5.73%165,200 | $2.10 | $18,842 | View SEC filing | |
| 2016-02-17 | WALT DAVID R Director | Purchase | +8,811 | +5.98%156,240 | $2.00 | $17,645 | View SEC filing | |
| 2016-02-12 | WALT DAVID R Director | Purchase | +8,850 | +6.39%147,429 | $2.05 | $18,172 | View SEC filing | |
| 2016-02-10 | WALT DAVID R Director | Purchase | +9,000 | +6.95%138,579 | $2.15 | $19,318 | View SEC filing | |
| 2016-02-08 | WALT DAVID R Director | Purchase | +8,563 | +7.08%129,579 | $2.30 | $19,706 | View SEC filing | |
| 2016-02-04 | WALT DAVID R Director | Purchase | +8,413 | +7.47%121,016 | $2.32 | $19,540 | View SEC filing | |
| 2016-02-02 | WALT DAVID R Director | Purchase | +5,700 | +5.33%112,603 | $2.38 | $13,550 | View SEC filing | |
| 2016-01-29 | WALT DAVID R Director | Purchase | +9,000 | +9.19%106,903 | $2.46 | $22,132 | View SEC filing | |
| 2016-01-27 | WALT DAVID R Director | Purchase | +8,800 | +9.88%97,903 | $2.39 | $21,075 | View SEC filing | |
| 2016-01-25 | WALT DAVID R Director | Purchase | +9,000 | +11.24%89,103 | $2.28 | $20,523 | View SEC filing | |
| 2016-01-21 | WALT DAVID R Director | Purchase | +8,900 | +12.50%80,103 | $2.43 | $21,660 | View SEC filing | |
| 2016-01-19 | WALT DAVID R Director | Purchase | +8,572 | +13.69%71,203 | $2.53 | $21,711 | View SEC filing | |
| 2016-01-14 | WALT DAVID R Director | Purchase | +8,684 | +16.10%62,631 | $2.79 | $24,209 | View SEC filing | |
| 2016-01-12 | WALT DAVID R Director | Purchase | +8,855 | +19.64%53,947 | $2.87 | $25,408 | View SEC filing | |
| 2016-01-08 | WALT DAVID R Director | Purchase | +8,800 | +24.25%45,092 | $2.95 | $25,985 | View SEC filing | |
| 2016-01-06 | WALT DAVID R Director | Purchase | +8,801 | +32.01%36,292 | $3.03 | $26,691 | View SEC filing | |
| 2015-12-07 | WALT DAVID R Director | Purchase | +10,000 | +57.17%27,491 | $3.75 | $37,488 | View SEC filing | |
| 2015-12-02 | WALT DAVID R Director | Purchase | +5,374 | +44.35%17,491 | $3.25 | $17,460 | View SEC filing | |
| 2015-11-30 | WALT DAVID R Director | Purchase | +12,117 | +100.00%12,117 | $3.32 | $40,197 | View SEC filing | |
| 2015-04-09 | CVF, LLC 10% Owner | Purchase | +333,333 | +14.75%2,592,577 | $6.00 | $1,999,998 | View SEC filing | |
| 2014-04-17 | VENROCK ASSOCIATES V LP 10% Owner | Purchase | +944,290 | +45.60%3,015,017 | $7.00 | $6,610,030 | View SEC filing | |
| 2014-04-17 | RASTETTER WILLIAM H Director | Purchase | +18,869 | +45.54%60,307 | $7.00 | $132,083 | View SEC filing |
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