CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net loss	$ (8,252)	$ (26,779)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	9,560	10,631
Stock-based compensation	8,657	6,428
Provisions for bad debts, net of recoveries	33	435
Loss on disposal of assets	130	351
Provision for excess and obsolete inventory	1,955	778
Deferred income tax benefit	(3,667)	(4,961)
Decrease (Increase) in:
Accounts receivable	4,311	28,132
Inventories	(9,106)	5,101
Prepaid expenses and other current assets	(2,935)	9,391
(Decrease) Increase in:
Accounts payable and accrued liabilities	(14,153)	(10,006)
Income taxes payable	(1,847)	(6,109)
Customer deposits	1,966	815
Unearned service revenues	(2,223)	(3,391)
Net cash (used in) provided by operating activities	(15,571)	10,816
Investing activities:
Purchases of property and equipment	(4,845)	(2,833)
Proceeds from asset sales	0	768
Proceeds from sale of investments	0	25,000
Payments for intangible assets	(1,933)	(813)
Acquisition of business, net of cash acquired	(33,908)	(6,036)
Net cash (used in) provided by investing activities	(40,686)	16,086
Financing activities:
Payments on finance leases	(229)	(237)
Payments of contingent consideration for acquisitions	0	(733)
Payments for taxes related to net share settlement of equity awards	(4,137)	(2,568)
Proceeds from issuance of stock related to stock option exercises	5,835	5,384
Net cash provided by financing activities	1,469	1,846
Effect of exchange rate changes on cash and cash equivalents	(5,031)	1,255
(Decrease) Increase in cash and cash equivalents	(59,819)	30,003
Cash and cash equivalents, beginning of period	185,633	133,634
Cash and cash equivalents, end of period	$ 125,814	$ 163,637