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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 26,184 $ 11,252
Short-term marketable securities 93,387 111,477
Prepaid expenses and other current assets 13,675 1,609
Total current assets 133,246 124,338
Long-term marketable securities 7,502  
Property and equipment, net 13,021 14,841
Right of use asset - operating lease 17,263  
Restricted cash 1,097 1,097
Prepaid research and development, net of current portion 16,381  
Other assets 64 64
Total assets 188,574 140,340
Current liabilities:    
Accounts payable 2,165 2,421
Accrued expenses 3,946 4,993
Deferred revenue 544 268
Deferred rent   393
Lease liability - operating lease 2,000  
Finance lease obligations 208 266
Total current liabilities 8,863 8,341
Long-term liabilities:    
Deferred rent, net of current portion   7,691
Lease liability - operating lease, net of current portion 22,804  
Finance lease obligations, net of current portion 2 210
Total long-term liabilities 22,806 7,901
Commitments and contingencies (Note 14)
Stockholders' Equity    
Common stock, $0.001 par value 250,000,000 shares authorized as of December 31, 2019 and December 31, 2018. 32,266,814 shares issued and outstanding as of December 31, 2019 and 25,401,479 shares issued and outstanding as of December 31, 2018. 33 25
Additional paid-in capital 327,900 243,903
Accumulated other comprehensive loss 110 (65)
Accumulated deficit (171,138) (119,765)
Total stockholders' equity 156,905 124,098
Total liabilities and stockholders' equity $ 188,574 $ 140,340