Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 7,278	$ 10,956
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	5,677	2,744
Purchase accounting adjustments to goodwill	(23)	520
Loss on inventory nonmonetary exchanges	0	147
Loss on disposal of property and equipment, net	0	40
Loss on disposal of intangible assets	0	21
Bond premium amortization	594	980
Stock-based compensation	11,423	6,742
Deferred income taxes	(4,155)	(2,672)
Unrecognized tax benefits	(134)	17
Tax benefit from stock-based compensation	0	(919)
Change in assets and liabilities:
Accounts and notes receivable	(26,027)	(14,409)
Inventory	(19,074)	(10,804)
Prepaid expenses and other assets	(11,261)	(10,441)
Accounts payable, accrued and other liabilities	2,906	12,566
Deferred revenue	26,460	26,331
Customer deposits	501	140
Net cash provided by (used in) operating activities	(5,835)	21,959
Cash flows from investing activities:
Purchases of investments	(19,950)	(49,316)
Proceeds from call / maturity of investments	49,633	55,235
Purchases of property and equipment	(9,072)	(3,335)
Proceeds from disposal of property and equipment	0	40
Purchases of intangible assets	(431)	(339)
Business acquisitions	(10,629)
Net cash provided by investing activities	9,551	2,285
Cash flows from financing activities:
Repurchase of common stock	0	(33,746)
Proceeds from options exercised	1,255	431
Payroll tax payments for net-settled stock awards	(2,830)	(1,299)
Payments on capital lease obligation	(25)	(29)
Payments on notes payable	0	(77)
Tax benefit from stock-based compensation	0	919
Net cash used in financing activities	(1,600)	(33,801)
Effect of exchange rate changes on cash and cash equivalents	704	631
Net increase (decrease) in cash and cash equivalents	2,820	(8,926)
Cash and cash equivalents, beginning of period	40,651	59,526
Cash and cash equivalents, end of period	43,471	50,600
Supplemental disclosure:
Cash paid for income taxes, net of refunds	12,206	11,308
Non-cash transactions
Property and equipment purchases in accounts payable and accrued liabilities	556	145
Contingent consideration related to business combinations	$ 1,007	$ 0