Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 8,083	$ 175,908
Due from related parties	1,089	217
Prepaid expenses and other current assets	5,135	3,105
Marketable securities	190,838	118,310
Total current assets	205,145	297,540
Marketable securities, noncurrent	87,571	55,135
Property, plant and equipment, net	18,906	5,523
Intangible assets, net	5,086	7,292
Other assets	788	1,359
Total assets	317,496	366,849
Current liabilities:
Accounts payable	4,045	2,085
Accrued expenses	5,864	2,575
Due to related parties	1,753	1,352
Other current liabilities	891	136
Total current liabilities	12,553	6,148
Build-to-suit liability, less current portion	5,651	2,468
Financing obligation, less current portion	2,025	0
Deferred rent	2,426	845
Deferred revenue	187	228
Deferred tax liability	996	1,165
Other liabilities	240	0
Total liabilities	24,078	10,854
Commitments and contingencies (Note 7)
Stockholders’ equity
Common stock	8	8
Additional paid-in capital	680,757	606,555
Accumulated other comprehensive loss	(284)	(192)
Accumulated deficit	(387,063)	(250,376)
Total stockholders’ equity	293,418	355,995
Total liabilities and stockholders’ equity	$ 317,496	$ 366,849