CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net income	$ 152	$ 455
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	4,749	4,343
Stock-based compensation	2,564	1,553
(Recoveries) provisions for bad debts, net	(100)	24
Loss on disposal of assets	57	127
Provision for excess and obsolete inventory	896	312
Deferred income tax expense (benefit)	8	(128)
Decrease (Increase) in:
Accounts receivable	12,410	1,808
Inventories	(10,908)	(5,208)
Prepaid expenses and other current assets	4,463	(936)
(Decrease) Increase in:
Accounts payable, accrued liabilities, and lease liability	(9,172)	(4,846)
Income taxes payable	(1,323)	(2,571)
Net cash provided by (used in) operating activities	5,810	(4,049)
Investing activities:
Purchases of property and equipment	(1,543)	(2,243)
Payments for intangible assets	(529)	(650)
Acquisition of businesses	0	(3,966)
Net cash used in investing activities	(2,072)	(6,859)
Financing activities:
Payments on finance leases	(90)	(46)
Payments of contingent consideration for acquisitions	(250)	0
Payments for taxes related to net share settlement of equity awards	(1,138)	0
Proceeds from issuance of stock related to stock option exercises	292	6,785
Net cash (used in) provided by financing activities	(1,186)	6,739
Effect of exchange rate changes on cash and cash equivalents	(639)	2,035
Increase (decrease) in cash and cash equivalents	1,913	(2,134)
Cash and cash equivalents, beginning of period	108,783	140,960
Cash and cash equivalents, end of period	110,696	138,826
Customer deposits
(Decrease) Increase in:
Customer deposits	(310)	(213)
Unearned service revenues	(310)	(213)
Current portion of unearned service revenues
(Decrease) Increase in:
Customer deposits	2,324	1,231
Unearned service revenues	$ 2,324	$ 1,231