Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 393,576	$ 83,300
Short-term investments	169,551	218,791
Accounts receivable, net	154,428	136,657
Deferred commissions	42,806	36,298
Prepaid expenses and other current assets	21,754	18,467
Total current assets	782,115	493,513
Capitalized software development costs, net	37,431	30,683
Property and equipment, net	20,817	23,962
Long-term investments	96,949	41,046
Intangible assets, net	0	7,421
Goodwill	25,894	25,894
Other assets, net	3,984	1,110
Total Assets	967,190	623,629
Liabilities:
Accounts payable	17,637	24,392
Accrued expenses	57,528	47,619
Deferred revenue, current portion	311,997	272,206
Convertible notes, net	248,025	0
Other liabilities	9,051	2,094
Total current liabilities	644,238	346,311
Convertible notes, net	285,168	238,435
Other liabilities, non-current	1,498	1,794
Deferred revenue, net of current portion	14,166	10,126
Total liabilities	945,070	596,666
Commitments and contingencies (Note 15)
Stockholders’ Equity:
Common stock, $0.0001 par value; 1,000,000 shares authorized, 57,512 and 56,516 shares issued and outstanding at December 31, 2017 and 2016, respectively	6	6
Additional paid-in capital	536,951	476,230
Accumulated deficit	(515,054)	(453,719)
Accumulated other comprehensive income	217	4,446
Total stockholders’ equity	22,120	26,963
Total Liabilities and Stockholders’ Equity	$ 967,190	$ 623,629