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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 282,876 $ 159,226
Prepaid expenses and other current assets 5,242 5,488
Total current assets 288,118 164,714
In-process research and development 58,200 58,200
Fixed assets, net 8,092 7,534
Other assets 2,146 416
Total assets 356,556 230,864
Current liabilities:    
Accounts payable 7,468 9,249
Accrued expenses 10,995 9,638
Other current liabilities 683 743
Current portion of long-term debt 3,113  
Total current liabilities 22,259 19,630
Long-term liabilities:    
Accrued lease expense, long-term   118
Other long-term liabilities 572 23
Debt, long-term 22,027 24,856
Total liabilities 44,858 44,627
Shareholders' equity:    
Common stock, $0.01 par value; 500,000,000 authorized shares, 61,813,995 and 49,806,131 issued and outstanding shares at December 31, 2015 and December 31, 2014, respectively 618 498
Additional paid-in capital 900,043 656,519
Accumulated deficit (588,963) (470,780)
Total shareholders' equity 311,698 186,237
Total liabilities and shareholders' equity $ 356,556 $ 230,864