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Segment Information - Summary of Operating Result Information for Each Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Revenue |  |  |  |
Revenue | $ 12,535 | $ 3,502 | $ 21,170 | $ 9,998
Cost of goods sold |  |  |  |
Cost of goods sold | 2,305 | 2,085 | 4,606 | 4,213
Gross profit |  |  |  |
Gross profit | 10,230 | 1,417 | 16,564 | 5,785
Operating expense | (21,306) | (9,107) | (39,296) | (22,185)
Loss from operations | (11,076) | (7,690) | (22,732) | (16,400)
Interest income |  | 2 |  | 29
Interest expense | (1,082) | (549) | (2,166) | (1,101)
Other income (expense), net | (5,435) | (73) | (4,883) | 18
Loss before income tax | (17,593) | (8,310) | (29,781) | (17,454)
Surgical Glaucoma |  |  |  |
Revenue |  |  |  |
Revenue | 11,988 | 3,299 | 20,127 | 9,399
Cost of goods sold |  |  |  |
Cost of goods sold | 1,773 | 1,508 | 3,631 | 3,022
Gross profit |  |  |  |
Gross profit | 10,215 | 1,791 | 16,496 | 6,377
Dry Eye |  |  |  |
Revenue |  |  |  |
Revenue | 547 | 203 | 1,043 | 599
Cost of goods sold |  |  |  |
Cost of goods sold | 532 | 577 | 975 | 1,191
Gross profit |  |  |  |
Gross profit | $ 15 | $ (374) | $ 68 | $ (592)

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