CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net loss	$ (26,779)	$ (12,452)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	10,631	14,203
Stock-based compensation	6,428	8,703
Provisions for bad debts, net of recoveries	435	1,000
Loss on disposal of assets	351	552
Provision for excess and obsolete inventory	778	2,431
Deferred income tax benefit	(4,961)	(69)
Impairment charge on equity method investment	0	1,535
Decrease (Increase) in:
Accounts receivable	28,132	21,883
Inventories	5,101	(9,471)
Prepaid expenses and other current assets	9,391	640
Increase (Decrease) in:
Accounts payable and accrued liabilities	(10,006)	(6,934)
Income taxes payable	(6,109)	(3,679)
Net cash provided by operating activities	10,816	23,466
Investing activities:
Purchases of property and equipment	(2,833)	(5,922)
Proceeds from sale of investments	25,000	33,700
Purchases of investments	0	(33,700)
Proceeds from asset sales	768	0
Payments for intangible assets	(813)	(2,035)
Acquisition of business, net of cash received	(6,036)	0
Loan originated to affiliate	0	(549)
Net cash provided by (used in) investing activities	16,086	(8,506)
Financing activities:
Payments on finance leases	(237)	(273)
Payments of contingent consideration for acquisitions	(733)	(3,101)
Payments for taxes related to net share settlement of equity awards	(2,568)	(1,389)
Proceeds from issuance of stock related to stock option exercises	5,384	2,328
Net cash provided by (used in) financing activities	1,846	(2,435)
Effect of exchange rate changes on cash and cash equivalents	1,255	(2,225)
Increase in cash and cash equivalents	30,003	10,300
Cash and cash equivalents, beginning of period	133,634	108,783
Cash and cash equivalents, end of period	163,637	119,083
Customer deposits
Increase (Decrease) in:
Increase (decrease) in contract with customer, liability	815	(685)
Current portion of unearned service revenues
Increase (Decrease) in:
Increase (decrease) in contract with customer, liability	$ (3,391)	$ 5,809