CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income (loss)	$ 3,482,000	$ (7,601,000)	$ (16,557,000)
Adjustments to reconcile net income (loss) to cash and cash equivalents provided by (used in) operating activities:
Depreciation and amortization	6,336,000	6,094,000	6,578,000
Bad debt expense	1,147,000	991,000	727,000
Stock-based compensation expense	8,976,000	10,598,000	11,947,000
Deferred income taxes	531,000	493,000	130,000
Other items, net	118,000	(851,000)	(869,000)
Changes in assets and liabilities, net of effects from acquisition:
Accounts receivable	361,000	2,634,000	(8,261,000)
Prepaid expenses and other assets	892,000	10,303,000	(5,514,000)
Deferred contract costs	3,146,000
Deferred contract costs		(6,730,000)	0
Accounts payable and accrued expenses	(2,306,000)	(10,936,000)	5,242,000
Deferred revenue	(3,383,000)	(3,765,000)	3,581,000
Cash and cash equivalents provided by (used in) operating activities	13,008,000	1,230,000	(2,996,000)
Cash flows from investing activities
Purchases of property and equipment	(986,000)	(2,045,000)	(2,790,000)
Payment of internal-use software development costs	(2,721,000)	(894,000)	(293,000)
Acquisition, net of cash acquired	0	0	(2,177,000)
Cash and cash equivalents used in investing activities	(3,707,000)	(2,939,000)	(5,260,000)
Cash flows from financing activities
Repayment of finance leases	(2,209,000)	(2,241,000)	(2,840,000)
Proceeds from exercise of stock options	974,000	1,106,000	1,428,000
Payment of statutory tax withholding related to net-share settlement of restricted stock units	(3,389,000)	(2,959,000)	(2,727,000)
Cash and cash equivalents used in financing activities	(4,624,000)	(4,094,000)	(4,139,000)
Effect of currency exchange rate changes on cash and cash equivalents	(77,000)	(434,000)	397,000
Net increase (decrease) in cash and cash equivalents	4,600,000	(6,237,000)	(11,998,000)
Cash and cash equivalents, beginning of period	47,185,000	53,422,000
Cash and cash equivalents, end of period	51,785,000	47,185,000	53,422,000
Supplemental disclosure of cash flow information
Cash paid for interest	215,000	30,000	111,000
Cash paid for income taxes, net	62,000	113,000	196,000
Supplemental disclosure of noncash investing and financing activities
Accrued capital expenditures	15,000	68,000	80,000
Finance lease obligations entered into for the purchase of fixed assets	$ 46,000	$ 4,217,000	$ 567,000