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Note 6 - Earnings (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
​ |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Numerator: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Net loss |  | $ | (8,953 | ) |  | $ | (15,627 | ) |  | $ | (42,190 | ) |  | $ | (46,147 | )
Denominator: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Weighted average shares used to compute net loss per share |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Basic |  |  | 32,774 |  |  |  | 27,839 |  |  |  | 30,392 |  |  |  | 27,640 |
Diluted |  |  | 32,774 |  |  |  | 27,839 |  |  |  | 30,392 |  |  |  | 27,640 |
Net loss per share |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Basic |  | $ | (0.27 | ) |  | $ | (0.56 | ) |  | $ | (1.39 | ) |  | $ | (1.67 | )
Diluted |  | $ | (0.27 | ) |  | $ | (0.56 | ) |  | $ | (1.39 | ) |  | $ | (1.67 | )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
​ |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Employee stock options |  |  | 8 |  |  | — |  |  |  | — |  |  |  | — |
Restricted stock units |  |  | 2,650 |  |  | 322 |  |  |  | 973 |  |  |  | — |
Shares for convertible senior notes |  |  | 4,587 |  |  |  | 4,587 |  |  |  | 4,587 |  |  |  | 4,587 |
Total antidilutive shares |  |  | 7,245 |  |  |  | 4,909 |  |  |  | 5,560 |  |  |  | 4,587 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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