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Unaudited Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenue:    
Total revenue $ 98,597 $ 92,750
Operating expenses:    
Cost of service revenue (exclusive of amounts shown below) 16,797 14,634
Cost of equipment revenue (exclusive of amounts shown below) 18,126 14,281
Engineering, design and development 7,879 5,406
Sales and marketing 6,877 6,231
General and administrative 14,199 13,458
Depreciation and amortization 2,791 3,791
Total operating expenses 66,669 57,801
Operating income 31,928 34,949
Other expense (income):    
Interest income (1,916) (47)
Interest expense 8,976 10,889
Other expense (income), net 31 (26)
Total other expense 7,091 10,816
Income before income taxes 24,837 24,133
Income tax provision 4,388 1,937
Net income $ 20,449 $ 22,196
Net income attributable to common stock per share    
Basic $ 0.16 $ 0.20
Diluted $ 0.15 $ 0.18
Weighted average number of shares:    
Basic 129,136 111,414
Diluted 133,602 134,095
Service [Member]    
Revenue:    
Total revenue $ 78,499 $ 70,667
Product [Member]    
Revenue:    
Total revenue $ 20,098 $ 22,083