Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Details)	12 Months Ended
	Dec. 31, 2021
Building
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful lives of assets	30 years
Building improvements | Minimum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful lives of assets	5 years
Building improvements | Maximum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful lives of assets	20 years
Furniture and Fixtures
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful lives of assets	5 years
Computer and office equipment
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful lives of assets	3 years
Purchased software
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful lives of assets	3 years