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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
The changes in the carrying value of goodwill by segment are as follows (in thousands):
 DME Services (a)
Balance as of December 31, 2021$3,710
Goodwill acquired—
Balance as of December 31, 2022$3,710
(a) The ITS segment has no recorded goodwill.
The carrying amount and accumulated amortization of intangible assets were as follows (in thousands):
December 31, 2022December 31, 2021
Gross AssetsAccumulated AmortizationNetGross AssetsAccumulated AmortizationNet
Nonamortizable intangible assets
Trade names
$2,000 $— $2,000 $2,000 $— $2,000 
Amortizable intangible assets
Trade names
23 (23)— 23 (23)— 
Physician and customer relationships
38,834 (33,594)5,240 38,834 (31,401)7,433 
Unpatented technology943 (258)685 943 (123)820 
Non-competition agreements472 (161)311 472 (67)405 
Software
10,300 (10,100)200 11,530 (11,258)272 
Total nonamortizable and amortizable intangible assets
$52,572 $(44,136)$8,436 $53,802 $(42,872)$10,930 
Amortization expense for intangible assets for the years ended December 31, 2022, 2021 and 2020 was $2.5 million, $4.3 million and $4.3 million, respectively, which was recorded in "amortization of intangibles expenses" for each period. Expected remaining annual amortization expense for the next five years for intangible assets recorded as of December 31, 2022 is as follows (in thousands):
202320242025202620272028 and
thereafter
Amortization expense
$990 $990 $810 $525 $471 $2,650