Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 88,028	$ 125,888
Accounts receivable, net of allowances of $1,640 and $1,279, respectively	117,307	82,763
Inventories, net	46,027	31,554
Prepaid expenses	15,401	23,518
Deferred tax assets	12,490	12,446
Other current assets	6,071	7,215
Total current assets	285,324	283,384
Property and equipment, net	34,772	36,178
Long-term net investment in sales-type leases	10,208	10,848
Goodwill	149,654	122,720
Intangible assets, net	94,285	82,667
Long-term deferred tax assets	1,397	1,144
Other long-term assets	25,382	23,273
Total assets	601,022	560,214
Current liabilities:
Accounts payable	26,085	19,432
Accrued compensation	18,573	19,874
Accrued liabilities	33,419	19,299
Deferred service revenue	23,527	25,167
Deferred gross profit	36,671	28,558
Total current liabilities	138,275	112,330
Long-term deferred service revenue	19,056	20,308
Long-term deferred tax liabilities	32,723	30,454
Other long-term liabilities	11,620	7,024
Total liabilities	$ 201,674	$ 170,116
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 100,000 shares authorized; 44,252 and 43,540 shares issued; 35,851 and 35,816 shares outstanding, respectively, respectively	$ 44	$ 43
Treasury stock, at cost, 8,401 and 7,721 shares outstanding	(160,074)	(135,053)
Additional paid-in capital	475,209	457,436
Retained earnings	84,102	69,033
Accumulated other comprehensive income (loss)	67	(1,361)
Total stockholders’ equity	399,348	390,098
Total liabilities and stockholders’ equity	$ 601,022	$ 560,214