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Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 32,905 $ 17,807
Short-term marketable securities 55,170 79,892
Prepaid expenses and other current assets 1,879 3,167
Restricted cash 550 0
Total current assets 90,504 100,866
Property and equipment, net 9,942 12,627
Operating lease right-of-use assets 21,286 23,509
Long-term marketable securities 1,993 17,871
Long-term restricted cash 896 1,446
Other long-term assets 91 0
Total assets 124,712 156,319
Current liabilities:    
Accounts payable 1,985 2,558
Accrued compensation 4,028 5,355
Accrued and other current liabilities 6,370 6,550
Deferred revenue 216 0
Derivative liability related to debt 963 0
Current portion of long-term debt 3,055 0
Total current liabilities 16,617 14,463
Operating lease liability, net of current portion 30,094 34,468
Long-term debt, net 18,409 24,508
Other long-term liabilities 23 0
Total liabilities 65,143 73,439
Commitments and contingencies (Note 7)
Stockholders’ equity:    
Convertible preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding
Common stock, $0.0001 par value; 300,000,000 shares authorized as of December 31, 2021 and 2020; 62,991,906 and 53,253,213 shares issued and outstanding as of December 31, 2021 and 2020, respectively 6 5
Additional paid-in capital 459,631 422,379
Related party promissory notes for purchase of common stock   (210)
Accumulated other comprehensive gain (44) 5
Accumulated deficit (400,024) (339,299)
Total stockholders’ equity 59,569 82,880
Total liabilities and stockholders’ equity $ 124,712 $ 156,319