Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 372,870	$ 852,467
Short-term investments	308,506
Accounts receivable, net of allowance of $0 at December 31, 2017 and December 31, 2016	103,677	77,260
Restricted cash	12,807	6,199
Prepaid expenses	24,253	22,951
Other current assets	8,837	6,599
Total current assets	830,950	965,476
Goodwill	730,464	613,335
Intangible assets, net	64,258	25,430
Property and equipment, net	266,589	269,439
Restricted cash	20,000	3,050
Prepaid expenses	23,821	18,598
Other non-current assets	43,251	10,521
Total assets	1,979,333	1,905,849
Current liabilities:
Accounts payable	18,938	23,999
Income tax payable	6,677	1,889
Deferred revenue	134,007	141,998
Other current liabilities	123,089	75,754
Total current liabilities	282,711	243,640
Deferred revenue	568	158
Deferred tax liabilities, net	5,902	5,791
Other non-current liabilities	48,912	75,596
Total liabilities	338,093	325,185
Stockholders’ equity:
Common stock, $0.00000625 par value, and additional paid-in capital - authorized shares: 2,020,517; shares outstanding: 870,660 shares (Class A, 783,376, Class B, 66,767 and Class C, 20,517) as of December 31, 2017 and 886,850 (Class A, 770,269, Class B, 96,064 and Class C, 20,517) as of December 31, 2016	3,426,505	3,349,714
Accumulated other comprehensive income (loss)	(93,497)	(128,694)
Accumulated deficit	(1,691,768)	(1,640,356)
Total stockholders’ equity	1,641,240	1,580,664
Total liabilities and stockholders’ equity	$ 1,979,333	$ 1,905,849