CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net loss	$ (23,755)	$ (6,253)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	7,209	9,322
Stock-based compensation	4,345	5,316
Provisions for bad debts, net of recoveries	680	2
Loss on disposal of assets	299	348
Provision for excess and obsolete inventory	479	1,481
Deferred income tax benefit	(2,404)	(11)
Impairment charge on equity method investment	0	1,535
Decrease (Increase) in:
Accounts receivable	26,180	14,442
Inventories	892	(9,687)
Prepaid expenses and other current assets	11,347	2,282
Increase (Decrease) in:
Accounts payable and accrued liabilities	(1,395)	(1,466)
Income taxes payable	(5,058)	(3,119)
Net cash provided by operating activities	16,064	17,744
Investing activities:
Purchases of property and equipment	(1,533)	(3,693)
Proceeds from sale of investments	25,000	0
Proceeds from asset sales	643	0
Payments for intangible assets	(673)	(1,233)
Net cash provided by (used in) investing activities	23,437	(4,926)
Financing activities:
Payments on finance leases	(160)	(187)
Payments of contingent consideration for acquisitions	0	(250)
Payments for taxes related to net share settlement of equity awards	(2,409)	(1,440)
Proceeds from issuance of stock related to stock option exercises	3,854	735
Net cash provided by (used in) financing activities	1,285	(1,142)
Effect of exchange rate changes on cash and cash equivalents	(720)	145
Increase in cash and cash equivalents	40,066	11,821
Cash and cash equivalents, beginning of period	133,634	108,783
Cash and cash equivalents, end of period	173,700	120,604
Customer deposits
Increase (Decrease) in:
Increase (decrease) in contract with customer, liability	384	(446)
Current portion of unearned service revenues
Increase (Decrease) in:
Increase (decrease) in contract with customer, liability	$ (3,139)	$ 3,998