CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 133,634	$ 108,783
Short-term investments	24,870	24,793
Accounts receivable, net	76,162	88,927
Inventories, net	58,554	65,444
Prepaid expenses and other current assets	28,996	28,795
Total current assets	322,216	316,742
Non-current assets:
Plant and equipment, net	26,954	30,417
Operating lease right-of-use asset	18,418
Goodwill	49,704	67,274
Intangible assets, net	14,471	33,054
Service and sales demonstration inventory, net	33,349	39,563
Deferred income tax assets, net	18,766	14,719
Other long-term assets	2,964	4,475
Total assets	486,842	506,244
Current liabilities:
Accounts payable	13,718	20,093
Accrued liabilities	38,072	36,327
Income taxes payable	5,182	5,081
Current portion of unearned service revenues	39,211	32,878
Customer deposits	3,108	3,144
Lease liability	6,674
Total current liabilities	105,965	97,523
Unearned service revenues - less current portion	20,578	15,505
Lease liability - less current portion	13,698
Deferred income tax liabilities	357	736
Income taxes payable - less current portion	13,177	12,247
Other long-term liabilities	1,075	3,624
Total liabilities	154,850	129,635
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; 18,988,379, 18,676,059 issued; 17,576,618 and 17,253,011 outstanding, respectively	19	19
Additional paid-in capital	267,868	251,329
Retained earnings	112,879	175,353
Accumulated other comprehensive loss	(17,399)	(18,483)
Common stock in treasury, at cost - 1,411,761 shares and 1,423,048, respectively	(31,375)	(31,609)
Total shareholders’ equity	331,992	376,609
Total liabilities and shareholders’ equity	$ 486,842	$ 506,244