CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ (10,765)	$ (1,479)	$ (15,306)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion	9,249	10,769	11,624
Goodwill impairment	8,849	0	0
Deferred income tax (benefit) expense	(3,253)	(1,692)	25,390
Stock based compensation	3,643	4,954	3,688
Provisions for doubtful accounts, service credits, adjustments of non-cash transaction taxes and other	694	1,922	222
Changes in assets and liabilities:
Accounts receivable	964	(915)	(9,648)
Prepaid expenses and other assets	2,913	(646)	244
Accounts payable, accrued liabilities and other	(643)	(1,732)	(3,278)
Deferred revenue	42	(866)	2,579
Net cash provided by operating activities	11,693	10,315	15,515
Cash flows from investing activities:
Purchases of property and equipment	(4,837)	(5,915)	(9,214)
Purchase of short-term investments	(59,385)	(3,911)	(3,957)
Maturity of short-term investments	34,000	4,000	4,000
Net cash used in investing activities	(30,222)	(5,826)	(9,171)
Cash flows from financing activities:
Cash distributions to stockholders	(9,819)	(10,064)	(15,234)
Purchase of common stock (including commissions)	(6,575)	(13,483)	(10,023)
Proceeds from issuance of common stock under the Employee Stock Purchase Plan	258	247	256
Purchase of common stock for tax withholding on vested equity awards	(1,017)	(976)	0
Net cash used in financing activities	(17,153)	(24,276)	(25,001)
Effect of exchange rate on cash	(300)	(49)	11
Net decrease in cash and cash equivalents	(35,982)	(19,836)	(18,646)
Cash and cash equivalents, beginning of period	83,343	103,179	121,825
Cash and cash equivalents, end of period	47,361	83,343	103,179
Supplemental disclosure:
Income taxes paid	$ 901	$ 1,061	$ 2,620