CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income	$ 47,215	$ 18,825	$ 3,482
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:
Depreciation and amortization	6,567	6,513	6,336
Bad debt expense	59	525	1,147
Stock-based compensation expense	12,034	10,200	8,976
Deferred income taxes	(29,477)	(39)	531
Other items, net	200	(829)	118
Changes in assets and liabilities, net of effects from acquisition:
Accounts receivable	(4,358)	(2,143)	361
Prepaid expenses and other assets	110	(1,728)	892
Deferred contract costs	(5,875)	(2,572)	(3,146)
Accounts payable and accrued expenses	76	4,270	(2,306)
Deferred revenue	7,701	1,284	(3,383)
Cash and cash equivalents provided by operating activities	34,252	34,306	13,008
Cash flows from investing activities
Acquisition, net of cash acquired	0	(8,467)	0
Purchases of property and equipment	(1,609)	(1,704)	(986)
Payment of software development costs	(3,395)	(3,034)	(2,721)
Cash and cash equivalents used in investing activities	(5,004)	(13,205)	(3,707)
Cash flows from financing activities
Repayment of finance leases	15	1,808	2,209
Proceeds from exercise of stock options	5,742	3,825	974
Payment of statutory tax withholding related to net-share settlement of restricted stock units	(5,743)	(3,294)	(3,389)
Payment of line of credit financing costs	0	(187)	0
Cash and cash equivalents used in financing activities	(16)	(1,464)	(4,624)
Effect of currency exchange rate changes on cash and cash equivalents	(210)	123	(77)
Net increase in cash and cash equivalents	29,022	19,760	4,600
Cash and cash equivalents, beginning of period	71,545	51,785	47,185
Cash and cash equivalents, end of period	100,567	71,545	51,785
Supplemental disclosure of cash flow information
Cash paid for interest	133	160	215
Cash paid for income taxes, net	487	462	62
Supplemental disclosure of noncash investing and financing activities
Accrued capital expenditures	78	32	15
Finance lease obligations entered into for the purchase of fixed assets	$ 0	$ 0	$ 46