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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Changes in Allowance for Doubtful Accounts
Changes in the allowance for credit losses was as follows:
Year Ended December 31,
202020192018
Allowance for credit loss, beginning of period$2,260 $2,765 $3,315 
Charges to (recoveries of) costs and expenses, net282 (216)610 
Account write-offs and other(276)(289)(1,160)
Allowance for credit loss, end of period$2,266 $2,260 $2,765 
Estimated Useful Lives of Property and Equipment Depreciation and amortization of property and equipment are computed on a straight-line basis over the following estimated useful lives:
Asset Classification Estimated Useful Life
Furniture and office equipment Five years
Computer equipment and software costs 
Three to five years
Leasehold improvements 
Lesser of term of lease or five years
Automobiles 
Five years
LandUnlimited
Property and equipment, net consisted of the following:
December 31,
 2020 2019
Furniture and office equipment$2,905 $6,108 
Computer equipment and software costs14,531 27,380 
Leasehold improvements2,373 4,062 
Automobiles1,268 1,995 
Land3,041 2,991 
Property and equipment, gross24,118 42,536 
Less: accumulated depreciation(15,136)(32,432)
Property and equipment, net$8,982 $10,104 
The following table sets forth our depreciation expense on property and equipment:
Year Ended December 31,
Location202020192018
Selling, general & administrative expenses$3,317 $2,987 $2,167