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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenue        
Revenue $ 21,370 $ 23,471 $ 40,635 $ 42,296
Cost of goods sold        
Cost of goods sold 3,025 3,381 5,819 6,429
Gross profit        
Gross profit 18,345 20,090 34,816 35,867
Operating expenses 30,996 35,277 62,191 68,621
Loss from operations (12,651) (15,187) (27,375) (32,754)
Investment income 1,526 1,793 3,174 3,602
Interest expense (1,145) (1,349) (2,350) (2,625)
Loss on debt extinguishment 0 0 (1,962) 0
Other expense, net (44) (3) (50) (22)
Loss before income taxes (12,314) (14,746) (28,563) (31,799)
Surgical Glaucoma        
Revenue        
Revenue 20,244 21,398 38,501 38,733
Cost of goods sold        
Cost of goods sold 2,423 2,444 4,632 4,806
Gross profit        
Gross profit 17,821 18,954 33,869 33,927
Dry Eye        
Revenue        
Revenue 1,126 2,073 2,134 3,563
Cost of goods sold        
Cost of goods sold 602 937 1,187 1,623
Gross profit        
Gross profit $ 524 $ 1,136 $ 947 $ 1,940