Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 57,757	$ 125,888
Accounts receivable, net of allowances of $1,733 and $1,279, respectively	115,680	82,763
Inventories	49,460	31,554
Prepaid expenses	17,698	23,518
Deferred tax assets	12,489	12,446
Other current assets	6,802	7,215
Total current assets	259,886	283,384
Property and equipment, net	34,026	36,178
Long-term net investment in sales-type leases	13,557	10,848
Goodwill	148,727	122,720
Intangible assets, net	92,042	82,667
Long-term deferred tax assets	1,513	1,144
Other long-term assets	26,971	23,273
Total assets	576,722	560,214
Current liabilities:
Accounts payable	24,691	19,432
Accrued compensation	15,224	19,874
Accrued liabilities	29,382	19,299
Deferred service revenue	26,168	25,167
Deferred gross profit	27,179	28,558
Total current liabilities	122,644	112,330
Deferred service revenue, long-term	18,436	20,308
Long-term deferred tax liabilities	32,320	30,454
Other long-term liabilities	11,782	7,024
Total liabilities	$ 185,182	$ 170,116
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 100,000 shares authorized; 44,548 and 43,540 shares issued; 35,403 and 35,816 shares outstanding, respectively	$ 45	$ 43
Treasury stock, at cost, 9,145 and 7,721 shares outstanding	(185,074)	(135,053)
Additional paid-in capital	485,919	457,436
Retained earnings	92,138	69,033
Accumulated other comprehensive income (loss)	(1,488)	(1,361)
Total stockholders’ equity	391,540	390,098
Total liabilities and stockholders’ equity	$ 576,722	$ 560,214