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Segment Information - Summary of Operating Result Information for Each Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Revenue |  |  |  |
Revenue | $ 20,157 | $ 20,009 | $ 60,792 | $ 62,305
Cost of goods sold |  |  |  |
Cost of goods sold | 3,250 | 2,677 | 9,068 | 9,105
Gross profit |  |  |  |
Gross profit | 16,907 | 17,332 | 51,724 | 53,200
Operating expenses | 28,136 | 30,743 | 90,327 | 99,364
Loss from operations | (11,229) | (13,411) | (38,603) | (46,164)
Investment income | 1,454 | 1,897 | 4,628 | 5,499
Interest expense | (1,151) | (1,432) | (3,501) | (4,057)
Loss on debt extinguishment | 0 | 0 | (1,962) | 0
Other income (expense), net | 26 | (11) | (25) | (34)
Loss before income taxes | (10,900) | (12,957) | (39,463) | (44,756)
Surgical Glaucoma |  |  |  |
Revenue |  |  |  |
Revenue | 18,632 | 18,425 | 57,132 | 57,158
Cost of goods sold |  |  |  |
Cost of goods sold | 2,453 | 2,002 | 7,084 | 6,808
Gross profit |  |  |  |
Gross profit | 16,179 | 16,423 | 50,048 | 50,350
Dry Eye |  |  |  |
Revenue |  |  |  |
Revenue | 1,525 | 1,584 | 3,660 | 5,147
Cost of goods sold |  |  |  |
Cost of goods sold | 797 | 675 | 1,984 | 2,297
Gross profit |  |  |  |
Gross profit | $ 728 | $ 909 | $ 1,676 | $ 2,850

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