Note 11 - Stock-based Compensation (Tables)
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9 Months Ended |
Sep. 30, 2021 |
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| Notes Tables |
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| Share-based Payment Arrangement, Option, Activity [Table Text Block] |
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Option numbers are in (000’s)
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Nine months ended September 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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4,199 |
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4.04 |
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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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(1,205 |
) |
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5.47 |
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| Outstanding, end of the period |
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14,869 |
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4.68 |
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6.8 |
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| Exercisable, end of the period |
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8,092 |
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4.55 |
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5.5 |
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| Vested and expected to vest, end of period |
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13,851 |
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4.67 |
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6.7 |
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| Option numbers are in (000’s) |
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Nine months ended September 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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6,352 |
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6.82 |
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| Exercised |
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(215 |
) |
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2.49 |
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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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12,007 |
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4.93 |
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8.2 |
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| Exercisable, end of the period |
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4,310 |
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2.99 |
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6.5 |
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| Vested and expected to vest, end of period |
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10,853 |
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4.82 |
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8.1 |
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| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
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Nine months ended September 30, 2021 |
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Nine months ended September 30, 2020 |
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| Risk-free interest rate |
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0.52 |
% |
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1.27 |
% |
| Expected dividend yield |
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- |
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- |
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| Expected volatility |
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81.8 |
% |
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85.9 |
% |
| Expected life of options (in years) |
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5 |
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5 |
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| Grant date fair value |
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$ |
2.59 |
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$ |
4.59 |
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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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Nine months ended
September 30, 2021 |
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Nine months ended
September 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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2,969 |
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5,190 |
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| Earlier of Performance criteria or 4 years |
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800 |
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- |
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| Total stock options granted in the period |
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4,199 |
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6,352 |
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| Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
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Nine months ended, September 30, 2021 |
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Nine months ended, September 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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| Vested |
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- |
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- |
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(685 |
) |
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7.01 |
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| Outstanding, end of period |
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- |
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$ |
- |
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- |
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$ |
- |
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| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
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Three months ended September 30, |
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Nine months ended September 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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$ |
609 |
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$ |
1,051 |
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$ |
2,985 |
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$ |
2,784 |
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| General and administrative |
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1,219 |
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3,854 |
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7,650 |
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14,223 |
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$ |
1,828 |
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$ |
4,905 |
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$ |
10,635 |
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$ |
17,007 |
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