Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows provided by operating activities:
Net (loss) income	$ (465)	$ 2,352
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	5,382	6,074
Deferred income tax (benefit) expense	(472)	1,069
Stock based compensation	2,501	1,953
Provision for doubtful accounts, service credits and other	1,016	458
Adjustment of non-cash transaction taxes	(104)	(700)
Changes in assets and liabilities:
Accounts receivable	(2,986)	(1,242)
Prepaid expenses, inventory, and other assets	(277)	(2,684)
Accounts payable, accrued liabilities and other	(3,394)	(3,261)
Deferred revenue	5,191	2,561
Net cash provided by operating activities	6,392	6,580
Cash flows used in investing activities:
Purchase of property and equipment	(3,464)	(5,198)
Net cash used in investing activities	(3,464)	(5,198)
Cash flows used in financing activities:
Cash distributions to stockholders	(5,201)	(10,239)
Purchase of common stock for tax withholding on vested equity awards	(894)	0
Purchase of common stock (including commissions)	(9,467)	(10,024)
Proceeds from issuance of common stock under the Employee Stock Purchase Plan	143	130
Net cash used in financing activities	(15,419)	(20,133)
Effect of exchange rate on cash	(598)	86
Net decrease in cash and cash equivalents	(13,089)	(18,665)
Cash and cash equivalents, beginning of period	107,157	125,816
Cash and cash equivalents, end of period	94,068	107,151
Supplemental disclosure:
Income taxes paid	$ 457	$ 1,964