Quarterly report pursuant to Section 13 or 15(d)

Balance Sheets

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Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 54,795 $ 32,305
Marketable securities   3,500
Prepaid expenses and other current assets 2,451 1,683
Total current assets 57,246 37,488
Restricted cash 1,310 1,309
Property and equipment, net 2,448 2,705
Right-of-use lease asset 5,303 5,472
Other assets 17 20
Total assets 66,324 46,994
Current liabilities:    
Accounts payable, net 1,243 1,047
Accrued expenses and other current liabilities 1,619 2,403
Current portion of loans payable, net   5,037
Lease liability 661 620
Total current liabilities 3,523 9,107
Leases, net of current portion 7,465 7,804
Warrant liability 8 5
Total liabilities 10,996 16,916
Commitments and contingencies (Note 8)
Stockholders' equity:    
Common stock-$0.001 par value; 200,000,000 shares authorized at June 30, 2020 and December 31, 2019; 127,210,272 and 94,213,760 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively 127 94
Preferred stock?$0.001 par value; 5,000,000 shares authorized, none issued or outstanding at June 30, 2020 and December 31, 2019
Additional paid-in capital 480,293 443,129
Accumulated deficit (425,092) (413,145)
Total stockholders' equity 55,328 30,078
Total liabilities and stockholders' equity $ 66,324 $ 46,994