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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue    
Revenue $ 42,772 $ 43,675
Percentage of total revenue (in percent) 100.00% 100.00%
Revenue from sale type lease    
Sales-type lease revenue $ 6,647 $ 6,052
Cost of sales-type lease revenue 1,851 1,680
Gross profit 4,796 4,372
Private insurers and other payers    
Revenue    
Revenue 28,283 30,237
Veterans Administration    
Revenue    
Revenue 5,846 7,058
Medicare    
Revenue    
Revenue 8,643 6,380
Flexitouch system    
Revenue    
Revenue $ 37,437 $ 38,586
Percentage of total revenue (in percent) 88.00% 88.00%
Other products    
Revenue    
Revenue $ 5,335 $ 5,089
Percentage of total revenue (in percent) 12.00% 12.00%