v3.22.2.2
CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities    
Net loss $ (21,528) $ (20,675)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization expense 89 418
Stock-based compensation 1,780 2,252
Amortization of discount on investments, net (52) 0
Gain on PPP Loan forgiveness 0 (662)
Other 101 39
Change in operating assets and liabilities:    
Contracts and other receivables 0 503
Prepaid materials 0 304
Prepaid expenses and other assets 802 784
Accounts payable 511 51
Accrued liabilities (217) 193
Accrued research and development expenses 271 1,250
Accrued compensation (319) (316)
Operating lease right-of-use assets and liabilities, net (46) 291
Other liabilities (665) (729)
Net cash used in operating activities (19,273) (16,297)
Investing activities    
Purchases of short-term investments (30,289) 0
Sales of short-term investments 5,000 0
Purchases of property and equipment (298) (210)
Net cash used in investing activities (25,587) (210)
Financing activities    
Proceeds from issuance of common stock, net 4,491 21,384
Proceeds from exercise of common stock options 0 27
Payments on financing leases 0 (81)
Net cash provided by financing activities 4,491 21,330
Net (decrease) increase in cash and cash equivalents (40,369) 4,823
Cash and cash equivalents at beginning of period 60,445 31,087
Cash and cash equivalents at end of period 20,076 35,910
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 20,014 35,848
Restricted cash 62 62
Total cash, cash equivalents and restricted cash 20,076 35,910
Supplemental disclosure of cash flow information    
Paycheck Protection Program loan forgiveness 0 662
Interest paid (348) (329)
Income taxes paid $ (1) $ (1)