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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (33,768) $ (30,163)
Adjustments to reconcile net loss to net cash used in operating activities:    
Equity-based compensation expense 2,099 2,586
Depreciation and amortization 126 62
Non-cash lease expense 141  
Loss on disposal of property and equipment 53  
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 607 (624)
Accounts payable 1,080 (696)
Accrued expenses 4,881 990
Lease liabilities (128)  
Net cash used in operating activities (24,909) (27,845)
Cash flows from investing activities:    
Purchases of property and equipment (21) (19)
Net cash used in investing activities (21) (19)
Cash flows from financing activities:    
Proceeds from issuance of common stock under employee stock plans 825 521
Net cash provided by financing activities 825 521
Net decrease in cash and restricted cash (24,105) (27,343)
Cash and restricted cash, beginning of period 157,979 181,174
Cash and restricted cash, end of period 133,874 153,831
Supplemental disclosure of cash flow information:    
Property and equipment purchases included in accounts payable $ 4 $ 7