Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 175,908	$ 59,104
Receivables, net, prepaid expenses and other current assets	3,322	269
Marketable securities	118,310
Marketable securities, noncurrent	55,135
Property and equipment, net	5,523	211
Other assets	1,359	409
Current liabilities:
Accounts payable	2,085	1,131
Accrued expenses	2,575	311
Due to related parties (See Note 9)	1,352
Other current liabilities	136	442
Total current liabilities	6,148	1,884
Build-to-suit lease liability, less current portion (See Note 8)	2,468
Deferred rent	845
Deferred revenue	228	$ 521
Deferred tax liability	$ 1,165
Commitments and contingencies (See Note 8)
Stockholders' Equity
Common stock	$ 8
Additional paid-in capital	606,555	$ 71,158
Accumulated other comprehensive loss	(192)
Total stockholders’ equity	355,995
As Adjusted
Current assets:
Total current assets	297,540	59,373
Intangible assets, net	7,292	3
Total assets	366,849	59,996
Current liabilities:
Total liabilities	10,854	2,405
Stockholders' Equity
Accumulated deficit	(250,376)	(13,573)
Total stockholders’ equity	355,995	57,591
Total liabilities and stockholders’ equity	$ 366,849	59,996
Common Class A
Stockholders' Equity
Common stock		$ 6