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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