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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Statement [Abstract] |  |  |  |
Sales | $ 4,296 | $ 6,649 | $ 9,293 | $ 12,278
Cost of sales | 2,202 | 1,975 | 4,215 | 4,041
Gross profit | 2,094 | 4,674 | 5,078 | 8,237
Other costs and expenses: |  |  |  |
Research and development | 975 | 888 | 1,955 | 1,618
Professional services | 1,658 | 1,661 | 4,047 | 3,779
Salaries and related costs | 3,439 | 3,510 | 6,750 | 6,998
Selling, general and administrative | 2,189 | 3,037 | 5,985 | 5,994
Total other costs and expenses | 8,261 | 9,096 | 18,737 | 18,389
Loss from operations | (6,167) | (4,422) | (13,659) | (10,152)
Interest income | 7 | 403 | 223 | 826
Interest expense | (8) | 0 | (14) | 0
Other (loss) income, net | (14) | (200) | 412 | (495)
Total other (loss) income, net | (15) | 203 | 621 | 331
Loss before income taxes | (6,182) | (4,219) | (13,038) | (9,821)
Income tax (benefit) expense | (1,492) | 76 | (6,397) | 82
Net loss | $ (4,690) | $ (4,295) | $ (6,641) | $ (9,903)
Earnings (loss) per Share: |  |  |  |
Basic and diluted (in dollars per share) | $ (0.14) | $ (0.13) | $ (0.19) | $ (0.30)

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