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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities    
Net loss $ (30,459) $ (16,785)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 11 192
Non-cash lease costs 204  
Stock-based compensation 4,037 3,004
Amortization of term loan discount and issuance costs   221
Changes in fair value of compound derivative liability and warrants   408
Changes in operating assets and liabilities    
Receivables due from related-party   9
Prepaid expenses and other current assets (531) (1,137)
Other assets (9,038)  
Accounts payable 5,802 (2,003)
Payable and accrued liabilities due to related party 716  
Accrued expenses and other current liabilities 1,210 1,100
Other non-current liabilities 2,291 (135)
Net cash used in operating activities (25,757) (15,126)
Investing activities    
Purchase of property and equipment (7) (10)
Net cash used in investing activities (7) (10)
Financing activities    
Proceeds from exercise of stock options under equity incentive plan 1,479  
Proceeds from issuance of common stock pursuant to employee stock purchase plan 103  
Proceeds from issuance of convertible preferred stock, net   104,680
Principal payments on finance lease obligations (73)  
Deferred offering costs   (458)
Net cash provided by financing activities 1,509 104,222
Net increase (decrease) in cash and cash equivalents (24,255) 89,086
Cash and cash equivalents at beginning of period 434,219 9,017
Cash and cash equivalents at end of period 409,964 98,103
Supplemental disclosure    
Cash paid for interest 3 188
Cash paid for taxes 274  
Supplemental disclosure of non-cash investing and financing activities    
Vesting of early exercised stock options   22
Deferred offering costs incurred but not paid   $ 1,953
Right-of-use asset acquired under operating leases 1,812  
Right-of-use asset acquired under finance leases 834  
Acquisition of property and equipment in accounts payable and other current liabilities $ 127