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Note 6 - Earnings (Loss) Per Share | 3 Months Ended
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Mar. 31, 2023
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. ​ 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 March 31, |
​ |  | 2023 |  |  | 2022 |
Numerator: |  | ​ |  |  | ​ |
Net loss |  | $ | (16,292 | ) |  | $ | (16,062 | )
Denominator: |  | ​ |  |  | ​ |
Weighted average shares used to compute net loss per share |  | ​ |  |  | ​ |
Basic |  |  | 28,872 |  |  |  | 27,463 |
Diluted |  |  | 28,872 |  |  |  | 27,463 |
Net loss per share |  | ​ |  |  | ​ |
Basic |  | $ | (0.56 | ) |  | $ | (0.58 | )
Diluted |  | $ | (0.56 | ) |  | $ | (0.58 | )
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 March 31, |
​ |  | 2023 |  |  | 2022 |
Employee stock options |  |  | — |  |  |  | __ |
Restricted stock units |  |  | 458 |  |  |  | __ |
Shares for convertible senior notes |  |  | 4,587 |  |  |  | 4,587 |
Total antidilutive shares |  |  | 5,045 |  |  |  | 4,587 |
​

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