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Note 8 - Share-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member]
 6 Months Ended
Jun. 30, 2023
$ / shares
shares
Unvested, number of units (in shares) | shares 4,223,156
Unvested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 5.37
Granted, number of units (in shares) | shares 3,487,110
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares $ 0.89
Vested and delivered, number of units (in shares) | shares (1,054,351)
Vested and delivered, weighted average grant-date fair value (in dollars per share) | $ / shares $ 3.13
Withheld as treasury stock (1), number of units (in shares) | shares (311,417) [1]
Withheld as treasury stock (1), weighted average grant-date fair value (in dollars per share) | $ / shares $ 1.82 [1]
Vested not delivered (2), number of units (in shares) | shares (19,592) [2]
Vested not delivered (2), weighted average grant-date fair value (in dollars per share) | $ / shares $ 1.41 [2]
Forfeited, number of units (in shares) | shares (732,396)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares $ 1.47
Unvested, number of units (in shares) | shares 5,592,510
Unvested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 4.05
[1] As discussed in Note 7, Common stock, treasury stock and warrants, the increase in treasury stock was due to shares withheld to cover statutory withholding taxes upon the delivery of shares following vesting of RSUs. As of June 30, 2023, there were 4,611,569 outstanding shares of treasury stock.
[2] Vested not delivered represents vested RSUs with delivery deferred to a future time. For the six months ended June 30, 2023, there was a net increase in the vested not delivered balance as a result of the vesting of the 19,592 shares that were deferred due to timing of delivery of certain shares. As of June 30, 2023, 1,719,592 outstanding RSUs were vested not delivered.