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Note 6 - Earnings (Loss) Per Share | 6 Months Ended
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Jun. 30, 2025
Notes to Financial Statements |
Earnings Per Share [Text Block] | Note 6. Earnings (Loss) Per Share ​ Basic net loss per share has been computed using the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share has been computed using the weighted-average number of shares of common stock and dilutive potential common shares from stock options, restricted stock units and senior convertible notes outstanding during the period. In periods with net losses, normally dilutive shares become anti-dilutive. Therefore, basic and diluted loss per share are the same. On March 13, 2025, the Company issued 7,945,399 stock warrants to a subsidiary of Amazon, and 1,324,233 warrants have been vested upon signing the warrant agreement. Because such warrants were out of money as of June 30, 2025, they are not considered dilutive instruments. ​ The following table sets forth the computation of the basic and diluted net loss per share for the periods indicated (in thousands): ​
|  | Three months ended June 30, |  |  | Six months ended June 30, |
​ |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Numerator: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Net loss |  | $ | (9,098 | ) |  | $ | (26,115 | ) |  | $ | (18,270 | ) |  | $ | (49,285 | )
Denominator: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Weighted average shares used to compute net loss per share |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Basic |  |  | 56,772 |  |  |  | 39,365 |  |  |  | 53,426 |  |  |  | 38,864 |
Diluted |  |  | 56,772 |  |  |  | 39,365 |  |  |  | 53,426 |  |  |  | 38,864 |
Net loss per share |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Basic |  | $ | (0.16 | ) |  | $ | (0.66 | ) |  | $ | (0.34 | ) |  | $ | (1.27 | )
Diluted |  | $ | (0.16 | ) |  | $ | (0.66 | ) |  | $ | (0.34 | ) |  | $ | (1.27 | )
The following potentially dilutive securities were excluded from the diluted net loss per share as their effect would have been antidilutive (in thousands):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
​ |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Restricted stock units |  |  | 2,143 |  |  |  | 2,455 |  |  |  | 2,435 |  |  |  | 2,813 |
Shares for convertible senior notes |  |  | 3,116 |  |  |  | 5,264 |  |  |  | 3,116 |  |  |  | 5,264 |
Total antidilutive shares |  |  | 5,259 |  |  |  | 7,719 |  |  |  | 5,551 |  |  |  | 8,077 |
​​

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