Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and equivalents	$ 78,661	$ 49,345
Short term investments	79,733	94,856
Accounts receivable, net of allowance for doubtful accounts of $520 in 2017 and $535 in 2016	48,126	36,693
Inventories, net	12,040	17,420
Prepaid expenses	3,876	3,249
Foreign sales tax receivable	836	186
Other current assets	4,665	5,410
Total current assets	227,937	207,159
Property and equipment
Furniture and fixtures	5,655	5,547
Office equipment	13,084	13,028
Property and equipment, gross	18,739	18,575
Accumulated depreciation	(13,963)	(15,294)
Property and equipment, net	4,776	3,281
Goodwill	56,332	54,409
Intangible assets, net of accumulated amortization	37,888	46,549
Deferred income taxes	5,460	11,116
Other assets	5,229	4,756
Total assets	337,622	327,270
Current liabilities
Accounts payable	8,144	8,915
Deferred revenue	33,295	36,364
Accrued wages and payroll taxes	11,643	10,894
Short-term income taxes payable	3,673	4,594
Other accrued expenses	7,746	5,464
Deferred compensation	1,652	1,729
Total current liabilities	66,153	67,960
Other long-term liabilities	12,938	5,709
Long-term income taxes payable	12,848
Deferred income taxes	7,753	439
Total liabilities	99,692	74,108
Stockholders' equity
Preferred stock: 500 shares authorized, none issued and outstanding at December 31, 2017 and 2016	0	0
Common stock: $.001 par value per share, 75,000 shares authorized; 40,086 and 40,097 issued and outstanding at December 31, 2017 and 2016, respectively	40	40
Additional paid-in capital	90,307	87,481
Accumulated income	156,151	178,551
Accumulated other comprehensive loss	(8,568)	(12,910)
Total stockholders' equity	237,930	253,162
Total liabilities and stockholders' equity	$ 337,622	$ 327,270