CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 185,633,000	$ 133,634,000
Short-term investments	0	24,870,000
Accounts receivable, net	64,616,000	76,162,000
Inventories, net	47,391,000	58,554,000
Prepaid expenses and other current assets	26,295,000	28,996,000
Total current assets	323,935,000	322,216,000
Non-current assets:
Property, plant and equipment, net	23,091,000	26,954,000
Operating lease right-of-use asset	26,107,000	18,418,000
Goodwill	57,541,000	49,704,000
Intangible assets, net	13,301,000	14,471,000
Service and sales demonstration inventory, net	31,831,000	33,349,000
Deferred income tax assets, net	47,450,000	18,766,000
Other long-term assets	2,336,000	2,964,000
Total assets	525,592,000	486,842,000
Current liabilities:
Accounts payable	14,121,000	13,718,000
Accrued liabilities	42,593,000	38,072,000
Income taxes payable	3,442,000	5,182,000
Current portion of unearned service revenues	39,149,000	39,211,000
Customer deposits	2,807,000	3,108,000
Lease liability	5,835,000	6,674,000
Total current liabilities	107,947,000	105,965,000
Unearned service revenues - less current portion	21,757,000	20,578,000
Lease liability - less current portion	22,131,000	13,698,000
Deferred income tax liabilities	787,000	357,000
Income taxes payable - less current portion	11,583,000	13,177,000
Other long-term liabilities	1,084,000	1,075,000
Total liabilities	165,289,000	154,850,000
Commitments and contingencies
Shareholders’ equity:
Preferred stock - par value $0.01, 10,000,000 shares authorized; none issued	0	0
Common stock - par value $0.001, 50,000,000 shares authorized; 19,384,350, 18,988,379 issued; 17,990,707 and 17,576,618 outstanding, respectively	19,000	19,000
Additional paid-in capital	287,979,000	267,868,000
Retained earnings	113,508,000	112,879,000
Accumulated other comprehensive loss	(10,160,000)	(17,399,000)
Common stock in treasury, at cost - 1,393,643 shares and 1,411,761, respectively	(31,043,000)	(31,375,000)
Total shareholders’ equity	360,303,000	331,992,000
Total liabilities and shareholders’ equity	$ 525,592,000	$ 486,842,000