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Segment Information - Summary of Operating Result Information for Each Reportable Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue    
Revenue $ 48,956 $ 27,640
Cost of goods sold    
Cost of goods sold 8,610 9,209
Gross profit    
Gross profit 40,346 18,431
Operating expense (91,824) (50,619)
Loss from operations (51,478) (32,188)
Interest income 30
Interest expense (4,366) (2,403)
Other expense, net (6,928) (71)
Loss before income taxes (62,772) (34,632)
Surgical Glaucoma    
Revenue    
Revenue 46,496 26,000
Cost of goods sold    
Cost of goods sold 6,473 7,069
Gross profit    
Gross profit 40,023 18,931
Dry Eye    
Revenue    
Revenue 2,460 1,640
Cost of goods sold    
Cost of goods sold 2,137 2,140
Gross profit    
Gross profit $ 323 $ (500)