CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 133,337	$ 185,633
Accounts receivable, net	59,966	64,616
Inventories, net	51,433	47,391
Prepaid expenses and other current assets	26,978	26,295
Total current assets	271,714	323,935
Non-current assets:
Property, plant and equipment, net	21,578	23,091
Operating lease right-of-use assets	23,356	26,107
Goodwill	81,702	57,541
Intangible assets, net	24,252	13,301
Service and sales demonstration inventory, net	31,477	31,831
Deferred income tax assets, net	47,251	47,450
Other long-term assets	2,251	2,336
Total assets	503,581	525,592
Current liabilities:
Accounts payable	14,115	14,121
Accrued liabilities	28,255	42,593
Income taxes payable	1,166	3,442
Current portion of unearned service revenues	40,098	39,149
Customer deposits	4,496	2,807
Lease liabilities	5,235	5,835
Total current liabilities	93,365	107,947
Unearned service revenues - less current portion	21,885	21,757
Lease liabilities - less current portion	19,962	22,131
Deferred income tax liabilities	674	787
Income taxes payable - less current portion	9,250	11,583
Other long-term liabilities	1,083	1,084
Total liabilities	146,219	165,289
Commitments and contingencies - See Note 12
Shareholders’ equity:
Common stock - par value $0.001, 50,000,000 shares authorized; 19,557,240 and 19,384,350 issued, respectively; 18,174,873 and 17,990,707 outstanding, respectively	20	19
Additional paid-in capital	294,490	287,979
Retained earnings	109,111	113,508
Accumulated other comprehensive loss	(15,467)	(10,160)
Common stock in treasury, at cost; 1,382,367 and 1,393,643 shares, respectively	(30,792)	(31,043)
Total shareholders’ equity	357,362	360,303
Total liabilities and shareholders’ equity	$ 503,581	$ 525,592