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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)