v3.26.1
Note 6 - Equity Incentive Plans (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Unrecognized compensation cost related to outstanding options $ 100,000   $ 100,000  
Unrecognized compensation cost weighted-average period of recognition     1 year 5 months 15 days  
Non-vested, Weighted Average Contractual Life (Years) [1] 4 years 3 months 25 days      
Maximum shares issued under ESPP $ 20,000 $ 3,000 $ 20,000 $ 3,000
Restricted Stock Units [Member]        
Number of Options Granted (in shares)     7,209,608 89,400
Performance Based Stock Units [Member]        
Number of Options Granted (in shares)     254,200 0
Stock Option [Member]        
Number of Options Granted (in shares)     0 108,600
RSUs and PSUs [Member]        
Unrecognized compensation cost related to outstanding RSUs 46,900,000   $ 46,900,000  
Non-vested, Weighted Average Contractual Life (Years)     2 years 4 months 24 days  
2021 Amended and Restated Employee Stock Purchase Plan [Member]        
Shares issued under the ESPP.     5,000  
Percentage of purchase price of common stock     85.00%  
Share based compensation expense $ 10,000,000 $ 9,000,000 $ 16,000,000 $ 21,000,000
2021 Amended and Restated Employee Stock Purchase Plan [Member] | Maximum [Member]        
Maximum shares issued under ESPP     $ 25,000,000  
Equity Incentive Plan [Member] | Restricted Stock Units [Member]        
Weighted-average grant date fair value of stock option     $ 1.71 $ 1.13
Equity Incentive Plan [Member] | Performance Based Stock Units [Member]        
Weighted-average grant date fair value of stock option     $ 1.38  
Equity Incentive Plan [Member] | Stock Option [Member]        
Weighted-average grant date fair value of stock option       $ 1.02
[1]

(1) The pre-funded common stock warrants outstanding as of June 30, 2026 have a perpetual term and are therefore excluded from the calculation of the weighted-average remaining contractual life.