CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net loss	$ (4,397)	$ (23,755)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	6,289	7,209
Stock-based compensation	5,377	4,345
Provisions for bad debts, net of recoveries	(43)	680
Loss on disposal of assets	86	299
Provision for excess and obsolete inventory	1,640	479
Deferred income tax benefit	(2,009)	(2,404)
Decrease (Increase) in:
Accounts receivable	3,964	26,180
Inventories	(7,495)	892
Prepaid expenses and other current assets	(982)	11,347
(Decrease) Increase in:
Accounts payable and accrued liabilities	(13,525)	(1,395)
Income taxes payable	(2,310)	(5,058)
Customer deposits	1,723	384
Unearned service revenues	(627)	(3,139)
Net cash (used in) provided by operating activities	(12,309)	16,064
Investing activities:
Purchases of property and equipment	(2,072)	(1,533)
Proceeds from asset sales	0	643
Proceeds from sale of investments	0	25,000
Payments for intangible assets	(1,780)	(673)
Acquisition of business, net of cash acquired	(33,908)	0
Net cash (used in) provided by investing activities	(37,760)	23,437
Financing activities:
Payments on finance leases	(167)	(160)
Payments for taxes related to net share settlement of equity awards	(3,779)	(2,409)
Proceeds from issuance of stock related to stock option exercises	5,165	3,854
Net cash provided by financing activities	1,219	1,285
Effect of exchange rate changes on cash and cash equivalents	(3,446)	(720)
(Decrease) Increase in cash and cash equivalents	(52,296)	40,066
Cash and cash equivalents, beginning of period	185,633	133,634
Cash and cash equivalents, end of period	$ 133,337	$ 173,700