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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 83,573 $ 58,103
Marketable securities 136,547 57,359
Tax incentive receivable 367 391
Prepaid expenses and other current assets 1,143 1,345
Total current assets 221,630 117,198
Property and equipment, net 215 79
Tax incentive receivable 673  
Other assets 84 242
Total assets 222,602 117,519
Current liabilities:    
Accounts payable 4,297 2,348
Accrued expenses 4,441 3,172
Notes payable, current 2,820 1,381
Total current liabilities 11,558 6,901
Notes payable, net of discount, long-term 4,851 6,177
Total liabilities $ 16,409 $ 13,078
Commitments and contingencies (Note 7)    
Stockholders' equity:    
Preferred stock; $0.001 par value; 5,000,000 shares authorized at June 30, 2015 and December 31, 2014; no shares issued and outstanding at June 30, 2015 and December 31, 2014    
Common stock, $0.001 par value; 115,000,000 shares authorized at June 30, 2015 and December 31, 2014; 27,117,822 and 22,879,160 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively $ 27 $ 23
Additional paid-in capital 342,839 209,838
Accumulated deficit (136,613) (105,385)
Accumulated other comprehensive loss (60) (35)
Total stockholders' equity 206,193 104,441
Total liabilities and stockholders' equity $ 222,602 $ 117,519