CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 108,783	$ 140,960
Short-term investments	24,793	10,997
Accounts receivable, net	88,927	72,105
Inventories, net	65,444	53,786
Prepaid expenses and other current assets	28,795	16,311
Total current assets	316,742	294,159
Property and equipment:
Machinery and equipment	76,048	66,514
Furniture and fixtures	6,749	6,945
Leasehold improvements	20,304	19,872
Property and equipment at cost	103,101	93,331
Less: accumulated depreciation and amortization	(72,684)	(61,452)
Property and equipment, net	30,417	31,879
Goodwill	67,274	52,750
Intangible assets, net	33,054	22,540
Service and sales demonstration inventory, net	39,563	39,614
Deferred income tax assets, net	14,719	15,606
Other long-term assets	4,475	2,030
Total assets	506,244	458,578
Current liabilities:
Accounts payable	20,093	11,569
Accrued liabilities	36,327	27,362
Income taxes payable	5,081	4,676
Total current liabilities	97,523	75,885
Unearned service revenues - less current portion	15,505	11,815
Deferred income tax liabilities	736	695
Income taxes payable - less current portion	12,247	15,952
Other long-term liabilities	3,624	2,165
Total liabilities	129,635	106,512
Commitments and contingencies
Shareholders’ equity:
Preferred stock - par value $0.01, 10,000,000 shares authorized; none issued	0	0
Common stock - par value $.001, 50,000,000 shares authorized; 18,676,059 and 18,277,142 issued; 17,253,011 and 16,796,884 outstanding, respectively	19	18
Additional paid-in capital	251,329	223,055
Retained earnings	175,353	168,624
Accumulated other comprehensive loss	(18,483)	(7,822)
Common stock in treasury, at cost - 1,423,048 shares and 1,480,258, respectively	(31,609)	(31,809)
Total shareholders’ equity	376,609	352,066
Total liabilities and shareholders’ equity	506,244	458,578
Current portion of unearned service revenues
Current liabilities:
Contract with customer, liability, current	32,878	29,674
Customer deposits
Current liabilities:
Contract with customer, liability, current	$ 3,144	$ 2,604