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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 8,894 $ 8,658
Adjustments to reconcile net income to net cash (used in) provided by operating activities, net of acquisitions:    
Depreciation and amortization 3,601 2,887
Deferred income taxes 165 42
Stock-based compensation 2,239 1,407
Amortization of debt issuance costs under the credit facility 184 186
Provision for doubtful accounts 252 224
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (6,397) 8,777
Prepaid expenses and other current assets (1,007) 973
Government stimulus (11,719)  
Accounts payable (290) (1,976)
Accrued payroll (15,313) 5,228
Accrued expenses and other long-term liabilities 1,025 (5,964)
Net cash (used in) provided by operating activities (18,366) 20,442
Cash flows from investing activities:    
Acquisitions of businesses, net of cash acquired   (87)
Purchases of property and equipment (1,021) (2,747)
Net cash used in investing activities (1,021) (2,834)
Cash flows from financing activities:    
Payments on term loan — credit facility (245)  
Payments on financing lease obligations   (10)
Cash received from exercise of stock options 101 1,151
Net cash (used in) provided by financing activities (144) 1,141
Net change in cash (19,531) 18,749
Cash, at beginning of period 145,078 111,714
Cash, at end of period 125,547 130,463
Supplemental disclosures of cash flow information:    
Cash paid for interest $ 1,174 731
Cash paid for income taxes   $ 1,954