Stock Option Plan - Exercise Price Range (Details) - $ / shares
|
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Information about stock options outstanding |
|
|
|
| Options Outstanding, Number |
6,354,308
|
6,664,173
|
|
| Options Outstanding, Weighted Average Remaining Contractual Life |
6 years 7 months 24 days
|
7 years 8 months 19 days
|
|
| Weighted average exercise price of options outstanding (in dollars per share) |
$ 6.80
|
$ 7.26
|
|
| Options Vested, Number |
3,783,385
|
3,209,532
|
|
| Options Vested, Weighted Average Remaining Contractual Life |
5 years 10 days
|
6 years 2 months 19 days
|
|
| Weighted average exercise price of options vested (in dollars per share) |
$ 9.09
|
$ 10.23
|
|
| Weighted average grant date fair value of options granted (in dollars per share) |
1.93
|
2.66
|
$ 2.53
|
| $0.28 - $2.00 |
|
|
|
| Information about stock options outstanding |
|
|
|
| Exercise Price, low end of range (in dollars per share) |
0.28
|
0.28
|
|
| Exercise Price, high end of range (in dollars per share) |
$ 2.00
|
$ 2.00
|
|
| Options Outstanding, Number |
110,000
|
190,500
|
|
| Options Outstanding, Weighted Average Remaining Contractual Life |
6 years 7 months 24 days
|
5 years 6 months 21 days
|
|
| Weighted average exercise price of options outstanding (in dollars per share) |
$ 1.45
|
$ 1.09
|
|
| Options Vested, Number |
110,000
|
100,500
|
|
| Options Vested, Weighted Average Remaining Contractual Life |
6 years 7 months 24 days
|
2 years 3 months 10 days
|
|
| Weighted average exercise price of options vested (in dollars per share) |
$ 1.45
|
$ 0.28
|
|
| $2.56 - $3.84 |
|
|
|
| Information about stock options outstanding |
|
|
|
| Exercise Price, low end of range (in dollars per share) |
2.56
|
2.56
|
|
| Exercise Price, high end of range (in dollars per share) |
$ 3.84
|
$ 3.84
|
|
| Options Outstanding, Number |
2,483,169
|
1,628,459
|
|
| Options Outstanding, Weighted Average Remaining Contractual Life |
8 years 5 months 19 days
|
8 years 10 months 6 days
|
|
| Weighted average exercise price of options outstanding (in dollars per share) |
$ 3.06
|
$ 3.53
|
|
| Options Vested, Number |
785,426
|
468,939
|
|
| Options Vested, Weighted Average Remaining Contractual Life |
6 years 9 months 7 days
|
8 years 6 months 10 days
|
|
| Weighted average exercise price of options vested (in dollars per share) |
$ 3.44
|
$ 3.56
|
|
| $3.88 - $5.82 |
|
|
|
| Information about stock options outstanding |
|
|
|
| Exercise Price, low end of range (in dollars per share) |
3.88
|
3.88
|
|
| Exercise Price, high end of range (in dollars per share) |
$ 5.82
|
$ 5.82
|
|
| Options Outstanding, Number |
999,064
|
1,707,500
|
|
| Options Outstanding, Weighted Average Remaining Contractual Life |
8 years 7 months 20 days
|
9 years 7 months 24 days
|
|
| Weighted average exercise price of options outstanding (in dollars per share) |
$ 4.02
|
$ 4.00
|
|
| Options Vested, Number |
288,670
|
130,106
|
|
| Options Vested, Weighted Average Remaining Contractual Life |
7 years 11 months 8 days
|
8 years 29 days
|
|
| Weighted average exercise price of options vested (in dollars per share) |
$ 4.03
|
$ 3.99
|
|
| $5.94 - $8.91 |
|
|
|
| Information about stock options outstanding |
|
|
|
| Exercise Price, low end of range (in dollars per share) |
5.94
|
5.94
|
|
| Exercise Price, high end of range (in dollars per share) |
$ 8.91
|
$ 8.91
|
|
| Options Outstanding, Number |
765,439
|
899,959
|
|
| Options Outstanding, Weighted Average Remaining Contractual Life |
5 years 3 months 21 days
|
7 years 5 months 1 day
|
|
| Weighted average exercise price of options outstanding (in dollars per share) |
$ 5.98
|
$ 5.98
|
|
| Options Vested, Number |
619,649
|
482,065
|
|
| Options Vested, Weighted Average Remaining Contractual Life |
4 years 11 months 1 day
|
6 years 11 months 19 days
|
|
| Weighted average exercise price of options vested (in dollars per share) |
$ 5.98
|
$ 5.98
|
|
| $9.52 - $14.28 |
|
|
|
| Information about stock options outstanding |
|
|
|
| Exercise Price, low end of range (in dollars per share) |
9.52
|
9.52
|
|
| Exercise Price, high end of range (in dollars per share) |
$ 14.28
|
$ 14.28
|
|
| Options Outstanding, Number |
846,636
|
955,947
|
|
| Options Outstanding, Weighted Average Remaining Contractual Life |
3 years 9 months 29 days
|
6 years 5 months 19 days
|
|
| Weighted average exercise price of options outstanding (in dollars per share) |
$ 10.74
|
$ 10.77
|
|
| Options Vested, Number |
829,640
|
762,488
|
|
| Options Vested, Weighted Average Remaining Contractual Life |
3 years 9 months 7 days
|
6 years 3 months 21 days
|
|
| Weighted average exercise price of options vested (in dollars per share) |
$ 10.72
|
$ 10.76
|
|
| $14.43 - $21.64 |
|
|
|
| Information about stock options outstanding |
|
|
|
| Exercise Price, low end of range (in dollars per share) |
14.43
|
14.43
|
|
| Exercise Price, high end of range (in dollars per share) |
$ 21.64
|
$ 21.64
|
|
| Options Outstanding, Number |
1,150,000
|
1,281,808
|
|
| Options Outstanding, Weighted Average Remaining Contractual Life |
3 years 11 months 8 days
|
5 years 2 months 1 day
|
|
| Weighted average exercise price of options outstanding (in dollars per share) |
$ 15.45
|
$ 15.44
|
|
| Options Vested, Number |
1,150,000
|
1,265,434
|
|
| Options Vested, Weighted Average Remaining Contractual Life |
3 years 11 months 8 days
|
5 years 1 month 24 days
|
|
| Weighted average exercise price of options vested (in dollars per share) |
$ 15.45
|
$ 15.42
|
|