CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and equivalents	$ 84,282	$ 76,708	$ 78,661
Short term investments	25,511	22,789
Accounts receivable, net of allowances of $2,524 in 2019 and $1,152 in 2018	62,405	59,631
Inventories, net	19,819	14,428
Prepaid expenses	6,198	4,733
Contract assets	7,058	7,962
Other current assets	6,346	5,705
Total current assets	211,619	191,956
Property and equipment, net	11,454	6,250
Operating lease right-of-use assets	10,580
Goodwill	94,612	91,841	56,332
Intangible assets, net of accumulated amortization	36,209	45,462	$ 37,888
Deferred income taxes	7,863	5,601
Contract assets - non-current	3,565	3,316
Other assets	8,668	8,400
Total assets	384,570	352,826
Current liabilities
Accounts payable	10,835	7,202
Deferred revenue	30,338	33,633
Accrued wages and payroll taxes	15,415	13,932
Short-term income taxes payable	7,711	6,905
Other accrued expenses	8,786	9,323
Deferred compensation	1,028	1,362
Total current liabilities	74,113	72,357
Long-term deferred revenue	15,259	10,672
Long-term lease liability	11,299
Other long-term liabilities	8,297	7,075
Long-term income taxes payable	6,958	7,620
Deferred income taxes	4,623	2,661
Total liabilities	120,549	100,385
Stockholders' equity
Preferred stock: 500 shares authorized, none issued and outstanding at December 31, 2019 and 2018
Common stock: $.001 par value per share, 75,000 shares authorized; 40,406 and 40,225 issued and outstanding at December 31, 2019 and 2018, respectively	40	40
Additional paid-in capital	96,109	93,310
Accumulated income	181,167	172,378
Accumulated other comprehensive loss	(13,295)	(13,287)
Total stockholders' equity	264,021	252,441
Total liabilities and stockholders' equity	$ 384,570	$ 352,826