Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 175,113	$ 402,102
Short-term investments	746,027	767,775
Accounts receivable, net of allowance for doubtful accounts of $1,816 and $2,021 at March 31, 2016 and December 31, 2015, respectively	141,247	172,752
Inventories	10,778	13,747
Prepaid expenses and other current assets	35,078	30,883
Total current assets	1,108,243	1,387,259
Property and equipment, net	81,324	78,368
Goodwill	974,184	750,288
Intangible assets, net	290,595	214,560
Deposits and other long-term assets	12,084	10,998
TOTAL ASSETS	2,466,430	2,441,473
CURRENT LIABILITIES:
Accounts payable	37,716	43,650
Accrued and other current liabilities	36,082	29,820
Accrued compensation	105,893	79,294
Deferred revenue, current portion	329,095	305,169
Total current liabilities	508,786	457,933
Convertible senior notes, net	714,978	706,198
Deferred revenue, non-current portion	236,987	221,829
Other long-term liabilities	9,298	11,141
Total liabilities	$ 1,470,049	$ 1,397,101
Commitments and contingencies
Stockholders' equity:
Common stock, par value of $0.0001 per share; 1,000,000 shares authorized, 166,223 shares and 161,643 shares issued and outstanding as of March 31, 2016 and December 31, 2015, respectively	$ 17	$ 16
Additional paid-in capital	2,512,269	2,403,088
Treasury stock, at cost; 3,333 shares as of March 31, 2016 and December 31, 2015	(150,000)	(150,000)
Accumulated other comprehensive loss	(62)	(2,225)
Accumulated deficit	(1,365,843)	(1,206,507)
Total stockholders’ equity	996,381	1,044,372
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 2,466,430	$ 2,441,473