Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows provided by operating activities:
Net loss	$ (1,255)	$ (1,667)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	6,999	8,168
Deferred income tax expense	(569)	(1,000)
Stock-based compensation	2,521	3,922
Provision for doubtful accounts, service credits and other	652	1,631
Adjustment of non-cash transaction taxes	0	(156)
Changes in assets and liabilities:
Accounts receivable	252	(2,534)
Prepaid expenses, inventory, and other assets	2,131	(1,160)
Accounts payable, accrued liabilities and other	(1,366)	(346)
Deferred revenue	1,383	4,998
Net cash provided by operating activities	10,748	11,856
Cash flows used in investing activities:
Purchase of property and equipment	(4,162)	(5,094)
Purchase of short-term investments	(44,499)	(3,911)
Maturity of short-term investments	19,000	4,000
Net cash used in investing activities	(29,661)	(5,005)
Cash flows used in financing activities:
Cash distributions to stockholders	(7,440)	(7,631)
Purchase of common stock (including commissions)	(6,575)	(10,026)
Proceeds from issuance of common stock under the Employee Stock Purchase Plan	119	143
Purchase of common stock for tax withholding on vested equity awards	(1,017)	(978)
Net cash used in financing activities	(14,913)	(18,492)
Effect of exchange rate on cash	(198)	(965)
Net decrease in cash and cash equivalents	(34,024)	(12,606)
Cash and cash equivalents, beginning of period	83,343	103,179
Cash and cash equivalents, end of period	49,319	90,573
Supplemental disclosure:
Income taxes paid	$ 927	$ 726