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Note 2 - Net Loss Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|  | 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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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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