Condensed Statements Of Comprehensive Loss - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
|
| Statements Of Comprehensive Income (Loss) [Abstract] | ||
| Net sales | $ 1,901 | $ 1,923 |
| Cost of goods sold | 911 | 924 |
| Gross profit | 990 | 999 |
| Operating expenses | ||
| Selling and marketing | 348 | 458 |
| General and administrative | 443 | 465 |
| Research and development | 203 | 217 |
| Total operating expenses | 994 | 1,140 |
| Operating loss | (4) | (141) |
| Non-operating income (expense) | ||
| Loss on investment | 0 | (3) |
| Interest income | 2 | 32 |
| Other income | 0 | 2 |
| Total non-operating income, net | 2 | 31 |
| Loss before income tax benefit | (2) | (110) |
| Benefit of income tax | 0 | (19) |
| Net loss | (2) | (91) |
| Other comprehensive income | ||
| Change in unrealized value of available-for-sale securities, net of income tax | 0 | 0 |
| Other comprehensive income | 0 | 0 |
| Net comprehensive loss | $ (2) | $ (91) |
| Basic | ||
| Net loss per share | $ 0.00 | $ (0.03) |
| Weighted average shares | 3,395,521 | 3,395,521 |
| Diluted | ||
| Net loss per share | $ 0.00 | $ (0.03) |
| Weighted average shares | 3,395,521 | 3,395,521 |