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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 11,196 $ 23,872
Due from related parties 55 154
Prepaid expenses and other current assets 4,958 4,152
Marketable debt securities 110,593 104,280
Total current assets 126,802 132,458
Marketable debt securities, noncurrent 15,091 29,600
Property, plant and equipment, net 76,826 76,726
Equity investment 8,500 8,500
Intangible assets, net 2,260 2,826
Other assets 366 330
Total assets 229,845 250,440
Current liabilities:    
Accounts payable 3,566 5,865
Accrued expenses 12,077 11,267
Due to related parties 2,456 2,363
Other current liabilities 1,299 1,373
Total current liabilities 19,398 20,868
Build-to-suit liability, less current portion 4,797 4,909
Financing obligation, less current portion 1,663 1,741
Deferred rent 3,188 3,325
Deferred tax liability 374 498
Other liabilities 65 255
Total liabilities 29,485 31,596
Commitments and contingencies (Note 8) 0 0
Stockholders’ equity    
Common stock, $0.0001 par value; 500,000,000 shares authorized; 79,088,200 and 79,021,878 issued and outstanding as of March 31, 2018 and December 31, 2017 8 8
Additional paid-in capital 726,953 717,930
Accumulated other comprehensive loss (555) (381)
Accumulated deficit (526,046) (498,713)
Total stockholders’ equity 200,360 218,844
Total liabilities and stockholders’ equity $ 229,845 $ 250,440