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Note 2 - Net Loss Per Common Share | 6 Months Ended
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Jun. 30, 2020
Notes to Financial Statements |
Earnings Per Share [Text Block] | 2. Net Loss Per Common Share Basic net loss per common share is calculated by dividing net loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. Diluted net loss per common share is computed by dividing net loss attributable to common stockholders by the weighted-average number of common share equivalents outstanding for the period determined using the treasury stock method. The following outstanding common stock equivalents have been excluded from diluted net loss per common share because their inclusion would be anti-dilutive:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Shares of common stock subject to outstanding options |  |  | 4,823,917 |  |  |  | 5,721,801 |  |  |  | 4,792,022 |  |  |  | 5,696,450 |
Employee stock purchase plan |  |  | 26,416 |  |  |  | 29,471 |  |  |  | 23,007 |  |  |  | 27,582 |
Restricted stock units |  |  | 945,325 |  |  |  | 752,607 |  |  |  | 941,776 |  |  |  | 646,274 |
Total common stock equivalents |  |  | 5,795,658 |  |  |  | 6,503,879 |  |  |  | 5,756,805 |  |  |  | 6,370,306 |

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