CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 125,814	$ 185,633
Accounts receivable, net	58,875	64,616
Inventories, net	55,507	47,391
Prepaid expenses and other current assets	28,776	26,295
Total current assets	268,972	323,935
Non-current assets:
Property, plant and equipment, net	22,576	23,091
Operating lease right-of-use assets	23,586	26,107
Goodwill	80,873	57,541
Intangible assets, net	24,714	13,301
Service and sales demonstration inventory, net	31,025	31,831
Deferred income tax assets, net	46,700	47,450
Other long-term assets	2,141	2,336
Total assets	500,587	525,592
Current liabilities:
Accounts payable	16,415	14,121
Accrued liabilities	26,625	42,593
Income taxes payable	0	3,442
Current portion of unearned service revenues	38,555	39,149
Customer deposits	4,709	2,807
Lease liabilities	5,630	5,835
Total current liabilities	91,934	107,947
Unearned service revenues - less current portion	21,242	21,757
Lease liabilities - less current portion	19,724	22,131
Deferred income tax liabilities	595	787
Income taxes payable - less current portion	9,250	11,583
Other long-term liabilities	1,071	1,084
Total liabilities	143,816	165,289
Commitments and contingencies - See Note 12
Shareholders’ equity:
Common stock - par value $0.001, 50,000,000 shares authorized; 19,584,783 and 19,384,350 issued, respectively; 18,202,416 and 17,990,707 outstanding, respectively	20	19
Additional paid-in capital	298,082	287,979
Retained earnings	105,256	113,508
Accumulated other comprehensive loss	(15,795)	(10,160)
Common stock in treasury, at cost; 1,382,367 and 1,393,643 shares, respectively	(30,792)	(31,043)
Total shareholders’ equity	356,771	360,303
Total liabilities and shareholders’ equity	$ 500,587	$ 525,592