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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 40,745 $ 40,777
Marketable securities 35,104 61,275
Tax incentive receivable 895 946
Prepaid expenses and other current assets 1,289 1,927
Total current assets 78,033 104,925
Tax incentive receivable 938  
Property and equipment, net 472 528
Other assets 357 57
Total assets 79,800 105,510
Current liabilities:    
Accounts payable 3,010 3,020
Accrued expenses 4,448 4,273
Notes payable, current 1,818  
Total current liabilities 9,276 7,293
Notes payable, long-term 18,502 20,000
Total liabilities 27,778 27,293
Commitments and contingencies (Note 7)
Stockholders' equity:    
Preferred stock; $0.001 par value per share; 5,000,000 shares authorized as of June 30, 2018 and December 31, 2017; no shares issued and outstanding as of June 30, 2018 and December 31, 2017
Common stock, $0.001 par value per share; 115,000,000 shares authorized as of June 30, 2018 and December 31, 2017; 27,578,989 and 27,489,457 shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively 28 27
Additional paid-in capital 373,308 367,825
Accumulated deficit (321,308) (289,577)
Accumulated other comprehensive loss (6) (58)
Total stockholders' equity 52,022 78,217
Total liabilities and stockholders' equity $ 79,800 $ 105,510