CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 157,240	$ 133,634
Short-term investments	15,955	24,870
Accounts receivable, net	58,834	76,162
Inventories, net	55,044	58,554
Prepaid expenses and other current assets	21,237	28,996
Total current assets	308,310	322,216
Non-current assets:
Plant and equipment, net	24,515	26,954
Operating lease right-of-use asset	16,534	18,418
Goodwill	48,661	49,704
Intangible assets, net	13,820	14,471
Service and sales demonstration inventory, net	34,355	33,349
Deferred income tax assets, net	21,036	18,766
Other long-term assets	2,818	2,964
Total assets	470,049	486,842
Current liabilities:
Accounts payable	11,396	13,718
Accrued liabilities	44,360	38,072
Income taxes payable	3,826	5,182
Lease liability	5,947	6,674
Total current liabilities	106,205	105,965
Unearned service revenues - less current portion	19,985	20,578
Lease liability - less current portion	12,745	13,698
Deferred income tax liabilities	173	357
Income taxes payable - less current portion	13,177	13,177
Other long-term liabilities	974	1,075
Total liabilities	153,259	154,850
Commitments and contingencies - See Note 14
Shareholders’ equity:
Common Stock, Value, Issued	19	19
Additional paid-in capital	270,940	267,868
Retained earnings	98,056	112,879
Accumulated other comprehensive loss	(21,177)	(17,399)
Treasury Stock, Value	(31,048)	(31,375)
Total shareholders’ equity	316,790	331,992
Total liabilities and shareholders’ equity	470,049	486,842
Current portion of unearned service revenues
Current liabilities:
Current portion of unearned service revenues	38,561	39,211
Customer deposits	38,561	39,211
Customer deposits
Current liabilities:
Current portion of unearned service revenues	2,115	3,108
Customer deposits	$ 2,115	$ 3,108