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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Schedule of Changes in Allowance for Doubtful Accounts
The following table presents the changes in the allowance for doubtful accounts (in thousands):
Year ended December 31,
202120202019
Balance, beginning of year$12,711 $9,049 $7,296 
Add: adoption of ASC 326— 461 — 
Add: provision for doubtful accounts9,615 10,515 9,129 
Less: write-offs, net of recoveries and other adjustments(8,314)(7,314)(7,376)
Balance, end of year$14,012 $12,711 $9,049 
Schedule of Changes in Contractual Allowance
The following table presents the changes in the contractual allowance (in thousands):
Year ended December 31,
202120202019
Balance, beginning of year$21,281 $15,433 $9,205 
Add: allowance for contractual adjustments27,459 20,916 15,518 
Less: contractual adjustments(17,466)(15,068)(9,290)
Balance, end of year$31,274 $21,281 $15,433 
Schedule of Disaggregated Revenue by Payor Type and Major Service Line Disaggregated revenue by payor type and major service line for the years ended December 31, 2021 and December 31, 2020 were as follows (in thousands):
Year Ended December 31,
202120202019
Contracted third-party payors$193,871 $135,939 $101,845 
Non-contracted third-party payors26,929 15,295 10,770 
Centers for Medicare & Medicaid44,529 72,536 58,918 
Healthcare institutions57,496 41,396 43,019 
Total$322,825 $265,166 $214,552