Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows provided by operating activities:
Net (loss) income	$ (946)	$ 6,078
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion	8,168	8,849
Deferred income tax (benefit) expense	(1,000)	1,118
Stock based compensation	3,922	2,815
Provision for doubtful accounts, service credits and other	1,681	767
Adjustment of non-cash transaction taxes	(156)	(754)
Changes in assets and liabilities:
Accounts receivable	(2,534)	(4,156)
Prepaid expenses, inventory, and other assets	(1,160)	(1,726)
Accounts payable, accrued liabilities and other	(546)	(230)
Deferred revenue	5,198	1,313
Net cash provided by operating activities	12,627	14,074
Cash flows used in investing activities:
Purchase of property and equipment	(5,094)	(7,034)
Net cash used in investing activities	(5,094)	(7,034)
Cash flows used in financing activities:
Cash distributions to stockholders	(7,631)	(12,733)
Purchase of common stock for tax withholding on vested equity awards	(978)	0
Purchase of common stock (including commissions)	(10,026)	(10,024)
Proceeds from issuance of common stock under the Employee Stock Purchase Plan	143	130
Net cash used in financing activities	(18,492)	(22,627)
Effect of exchange rate on cash	(965)	(89)
Net decrease in cash and cash equivalents	(11,924)	(15,676)
Cash and cash equivalents, beginning of period	107,157	125,816
Cash and cash equivalents, end of period	95,233	110,140
Supplemental disclosure:
Income taxes paid	$ 726	$ 2,300