CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Current assets
Cash and equivalents	$ 79,624	$ 84,282	$ 69,907
Short term investments	25,652	25,511
Accounts receivable, net of allowances of $3,165 in 2020 and $2,524 in 2019	62,971	62,405
Inventories, net	18,373	19,819
Prepaid expenses	6,334	6,198
Contract assets	7,389	7,058
Other current assets	7,626	6,346
Total current assets	207,969	211,619
Property and equipment, net	12,157	11,454
Operating lease right-of-use assets	11,538	10,580
Goodwill	91,556	94,612
Intangible assets, net of accumulated amortization	33,052	36,209
Deferred income taxes	7,966	7,863
Contract assets - non-current	3,792	3,565
Other assets	8,967	8,668
Total assets	376,997	384,570
Current liabilities
Accounts payable	9,113	10,835
Deferred revenue	33,349	30,338
Accrued wages and payroll taxes	10,706	15,415
Short-term income taxes payable	2,974	7,711
Other accrued expenses	11,081	8,786
Deferred compensation	1,446	1,028
Total current liabilities	68,669	74,113
Long-term deferred revenue	16,033	15,259
Long-term lease liability	12,600	11,299
Other long-term liabilities	7,711	8,297
Long-term income taxes payable	6,958	6,958
Deferred income taxes	4,387	4,623
Total liabilities	116,358	120,549
Stockholders' equity
Preferred stock: 500 shares authorized, none issued and outstanding at December 31, 2020 and 2019
Common stock: $.001 par value per share, 75,000 shares authorized; 40,314 and 40,207 issued and outstanding at March 31, 2020 and December 31, 2019, respectively	40	40
Additional paid-in capital	97,166	96,109
Accumulated income	181,012	181,167
Accumulated other comprehensive loss	(17,579)	(13,295)
Total stockholders' equity	260,639	264,021
Total liabilities and stockholders' equity	$ 376,997	$ 384,570