Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net income	$ 13,762	$ 12,792
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,916	3,644
Provision for bad debt	303	237
Stock-based compensation	11,044	9,154
Amortization of debt issuance costs	7	7
Deferred tax provision	158	(412)
Changes in operating assets and liabilities:
Accounts receivable	2,419	5,162
Prepaid expenses and other current assets	(3,094)	152
Other assets	30	(58)
Accounts payable	(412)	139
Income taxes payable	953	550
Accrued expenses and other current liabilities	(190)	(63)
Operating lease right-of-use assets and liabilities, net	(263)	(237)
Accrued compensation expenses	(516)	(452)
Contract liabilities	2,366	(623)
Other liabilities	1,865	1
Net cash provided by operating activities	33,348	29,993
Investing activities:
Purchases of property and equipment, and other capitalized assets	(4,943)	(4,771)
Purchases of investments and maturities of investments	(96)	500
Acquisitions of businesses, net	(5,015)
Net cash used in investing activities	(10,054)	(4,271)
Financing activities:
Tax withholdings related to net share settlements	(3,146)	(2,619)
Purchase of treasury shares and related costs	(14,824)	(4,725)
Proceeds from exercise of stock options	460	119
Term loan principal payment	(938)	(938)
Debt issuance costs	(11)
Net cash used in financing activities	(18,459)	(8,163)
Effect of exchange rate changes on cash	86	(92)
Net increase in cash	4,921	17,467
Cash at beginning of period	52,487	34,673
Cash at end of period	57,408	52,140
Supplemental disclosure of cash flow information:
Cash paid for taxes, net	$ 4,906	$ 3,512