Note 11 - Stock-based Compensation (Tables)
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6 Months Ended |
Jun. 30, 2021 |
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| Notes Tables |
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| Share-based Payment Arrangement, Option, Activity [Table Text Block] |
| Option numbers are in (000’s) |
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Six months ended June 30, 2021 |
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Options |
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Weighted average exercise price |
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Weighted average remaining
contractual life
(years) |
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| Outstanding, beginning of period |
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11,942 |
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$ |
4.97 |
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| Granted |
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3,156 |
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|
4.55 |
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| Exercised |
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(67 |
) |
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2.39 |
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| Forfeited |
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(800 |
) |
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|
5.67 |
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| Outstanding, end of the period |
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|
14,231 |
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4.88 |
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6.9 |
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| Exercisable, end of the period |
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|
8,001 |
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4.60 |
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5.7 |
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| Vested and expected to vest, end of period |
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13,296 |
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|
4.85 |
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6.8 |
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| Option numbers are in (000’s) |
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Six months ended June 30, 2020 |
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Options |
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|
Weighted average exercise price |
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|
Weighted average remaining
contractual life
(years) |
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| Outstanding, beginning of period |
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|
5,941 |
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$ |
2.84 |
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| Granted |
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|
6,272 |
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|
6.84 |
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| Exercised |
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(191 |
) |
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2.55 |
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| Forfeited |
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(71 |
) |
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2.87 |
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| Outstanding, end of the period |
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11,951 |
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4.91 |
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8.4 |
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| Exercisable, end of the period |
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4,190 |
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2.97 |
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6.6 |
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| Vested and expected to vest, end of period |
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10,786 |
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|
4.79 |
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|
8.3 |
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| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
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Six months ended June 30, 2021 |
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Six months ended June 30, 2020 |
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| Risk-free interest rate |
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0.43 |
% |
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1.28 |
% |
| Expected dividend yield |
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- |
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- |
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| Expected volatility |
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80.8 |
% |
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85.9 |
% |
| Expected life of options (years) |
|
5 |
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|
5 |
|
| Grant date fair value |
|
$ |
2.91 |
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$ |
4.61 |
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| Schedule of Share-based Payment Award, Options, Grants in Period [Table Text Block] |
| Option numbers are in (000’s) |
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Six months ended
June 30, 2021 |
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Six months ended
June 30, 2020 |
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Number of options |
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Number of options |
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| Cliff vesting after one year anniversary |
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- |
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300 |
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| 3 year vesting (50%-25%-25%) |
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|
430 |
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|
862 |
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| 4 year vesting (50%-16 2/3%-16 2/3%-16 2/3%) |
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2,726 |
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5,110 |
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| Total stock options granted in the period |
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3,156 |
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6,272 |
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| Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
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Six months ended, June 30, 2021 |
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Six months ended, June 30, 2020 |
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Number (in thousands) |
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Weighted average grant date fair value |
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Number (in thousands) |
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Weighted average grant date fair value |
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| Outstanding, beginning of period |
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- |
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$ |
- |
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|
40 |
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$ |
2.00 |
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| Granted |
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- |
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- |
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|
645 |
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|
7.32 |
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| Outstanding, end of period |
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|
- |
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$ |
- |
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|
685 |
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$ |
7.01 |
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| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
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Three months ended June 30, |
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Six months ended June 30, |
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2021 |
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2020 |
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2021 |
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2020 |
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| Research and development |
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$ |
998 |
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$ |
933 |
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$ |
2,376 |
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$ |
1,733 |
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| General and administrative |
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|
1,166 |
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6,768 |
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6,431 |
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|
10,369 |
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$ |
2,164 |
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$ |
7,701 |
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$ |
8,807 |
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$ |
12,102 |
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