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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue        
Revenue $ 13,101 $ 8,651 $ 34,271 $ 18,649
Cost of goods sold        
Cost of goods sold 2,062 2,620 6,668 6,833
Gross profit        
Gross profit 11,039 6,031 27,603 11,816
Operating expense (25,069) (13,386) (64,365) (35,571)
Loss from operations (14,030) (7,355) (36,762) (23,755)
Interest income   1   30
Interest expense (1,122) (538) (3,288) (1,639)
Other expense, net (2,001) (197) (6,884) 179
Loss before income tax (17,153) (8,089) (46,934) (25,543)
Surgical Glaucoma        
Revenue        
Revenue 12,446 7,883 32,573 17,282
Cost of goods sold        
Cost of goods sold 1,621 1,946 5,252 4,968
Gross profit        
Gross profit 10,825 5,937 27,321 12,314
Dry Eye        
Revenue        
Revenue 655 768 1,698 1,367
Cost of goods sold        
Cost of goods sold 441 674 1,416 1,865
Gross profit        
Gross profit $ 214 $ 94 $ 282 $ (498)