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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 38,980 $ 27,211
Marketable debt securities 24,905 43,050
Tax incentive receivable 214 243
Prepaid expenses and other current assets 581 999
Total current assets 64,680 71,503
Property and equipment, net 743 821
Operating lease right-of-use assets 6,928 7,051
Restricted cash 1,339 1,339
Other assets 12 20
Total assets 73,702 80,734
Current liabilities:    
Accounts payable 322 632
Accrued expenses 881 1,190
Accrued restructuring costs 981 2,709
Operating lease liabilities, current 410 386
Notes payable, current 7,273 7,273
Total current liabilities 9,867 12,190
Notes payable, long-term 6,747 8,464
Operating lease liabilities 6,346 6,456
Total liabilities 22,960 27,110
Commitments and contingencies (Note 7)
Stockholders' equity:    
Preferred stock; $0.001 par value per share; 5,000,000 shares authorized as of March 31, 2020 and December 31, 2019; no shares issued and outstanding as of March 31, 2020 and December 31, 2019
Common stock, $0.001 par value per share; 115,000,000 shares authorized as of March 31, 2020 and December 31, 2019; 37,469,596 and 37,446,498 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively 37 37
Additional paid-in capital 450,623 449,903
Accumulated deficit (399,949) (396,351)
Accumulated other comprehensive income 31 35
Total stockholders' equity 50,742 53,624
Total liabilities and stockholders' equity $ 73,702 $ 80,734