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Net Loss Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Loss Per Share | 5. NET LOSS PER SHARE Basic and diluted loss per share were calculated using the following:
|  | Year ended December 31, |
In Thousands, Except Share Data and Per Share Amounts |  | 2020 |  |  | 2019 |  |  | 2018 |
Net loss |  | $ | (44,836 | ) |  | $ | (39,612 | ) |  | $ | (27,897 | )
Weighted average shares outstanding - basic and diluted |  |  | 33,882,406 |  |  |  | 32,805,684 |  |  |  | 30,683,421 |
Basic and diluted loss per share |  | $ | (1.32 | ) |  | $ | (1.21 | ) |  | $ | (0.91 | )
|  | Year ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Anti-dilutive stock options, restricted stock units and performance stock units |  |  | 5,522,418 |  |  |  | 5,606,552 |  |  |  | 4,253,301 |
All outstanding stock options and restricted stock units are excluded from the calculation since they are anti-dilutive. We have not used the treasury method in determining the number of anti-dilutive stock options and restricted stock units in the table above.

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