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Statements of Operations and Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Operating expenses include stock-based compensation as follows: |  |
Total stock-based compensation | $ 743 | $ 805
Research and development |  |
Operating expenses include stock-based compensation as follows: |  |
Total stock-based compensation | 181 | 162
General and administrative |  |
Operating expenses include stock-based compensation as follows: |  |
Total stock-based compensation | 485 | 585
Sales and marketing |  |
Operating expenses include stock-based compensation as follows: |  |
Total stock-based compensation | $ 77 | $ 58

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