Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and equivalents	$ 35,578	$ 78,522
Short term investments	100,172	44,961
Accounts receivable, net of allowance for doubtful accounts of $505 in 2016 and $621 in 2015	32,691	29,426
Inventories	17,919	20,618
Prepaid expenses	3,296	3,051
Foreign sales tax receivable	339	510
Deferred income taxes	0	1,495
Other current assets	4,380	4,778
Assets of discontinued operations	3	4
Total current assets	194,378	183,365
Property and equipment:
Furniture and fixtures	5,573	5,354
Office equipment	13,205	11,512
Property and equipment, gross	18,778	16,866
Accumulated depreciation	(14,704)	(13,767)
Property and equipment, net	4,074	3,099
Goodwill, net of accumulated amortization	70,937	80,853
Intangible assets, net of accumulated amortization	33,471	37,970
Other assets, net of accumulated amortization	11,263	6,535
Total assets	314,123	311,822
Current liabilities
Accounts payable	7,929	8,803
Deferred revenue	28,331	22,450
Accrued wages and payroll taxes	10,404	10,291
Income taxes payable	6,130	4,823
Other accrued expenses	5,103	7,820
Deferred compensation	560	1,503
Total current liabilities	58,457	55,690
Other long-term liabilities	59	76
Deferred income taxes	1,025	8,008
Total liabilities	59,541	63,774
Stockholders' equity
Preferred stock: 500 shares authorized, none issued and outstanding at June 30, 2016 or December 31, 2015	0	0
Common stock: $.001 par value per share, 75,000 shares authorized; 40,199 and 40,108 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	40	40
Additional paid-in capital	87,708	85,766
Accumulated income	173,061	168,036
Accumulated other comprehensive income	(6,227)	(5,794)
Total stockholders' equity	254,582	248,048
Total liabilities and stockholders' equity	$ 314,123	$ 311,822