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Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 19,453 $ 26,184
Short-term marketable securities 94,796 93,387
Prepaid expenses and other current assets 13,166 13,675
Total current assets 127,415 133,246
Long-term marketable securities   7,502
Property and equipment, net 12,661 13,021
Right of use asset - operating lease 16,843 17,263
Restricted cash 1,097 1,097
Prepaid research and development, net of current portion 13,055 16,381
Other assets 64 64
Total assets 171,135 188,574
Current liabilities:    
Accounts payable 1,696 2,165
Accrued expenses 2,327 3,946
Deferred revenue 445 544
Lease liability - operating lease 2,210 2,000
Finance lease obligations 141 208
Total current liabilities 6,819 8,863
Long-term liabilities:    
Lease liability - operating lease, net of current portion 22,198 22,804
Finance lease obligations, net of current portion 1 2
Total long-term liabilities 22,199 22,806
Commitments and contingencies (Note 11)
Stockholders' Equity    
Common stock, $0.001 par value 250,000,000 shares authorized as of March 31, 2020 and December 31, 2019. 32,459,394 and 32,266,814 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively. 33 33
Additional paid-in capital 328,995 327,900
Accumulated other comprehensive loss 55 110
Accumulated deficit (186,966) (171,138)
Total stockholders' equity 142,117 156,905
Total liabilities and stockholders' equity $ 171,135 $ 188,574