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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (13,345,000) $ (5,674,000)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation 2,000  
Stock-based compensation 1,031,000  
Non-cash interest expense (92,000)  
Amortization of right of use lease asset 97,000 25,000
Accretion of lease liability 19,000  
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (855,000) 309,000
Accounts payable (1,069,000) (1,717,000)
Accrued expenses and other current liabilities 1,002,000 (890,000)
Other assets, noncurrent (822,000)  
Operating lease liabilities (119,000) (31,000)
Net cash used in operating activities (14,151,000) (7,978,000)
Cash flows from investing activities:    
Purchases of marketable securities (74,566,000)  
Purchases of property and equipment (65,000)  
Net cash used in investing activities (74,631,000)  
Cash flows from financing activities:    
Proceeds from issuance of Series C preferred stock, net   39,668,000
Net cash provided by financing activities   39,668,000
Net increase (decrease) in cash, cash equivalents and restricted cash (88,782,000) 31,690,000
Effect of exchange rate changes on cash, cash equivalents and restricted cash (604,000) (210,000)
Cash, cash equivalents and restricted cash, beginning of period 163,836,000 11,525,000
Cash, cash equivalents and restricted cash, end of period 74,450,000 43,005,000
Components of cash, cash equivalents and restricted cash    
Cash and cash equivalents 74,253,000 42,779,000
Restricted cash 197,000 226,000
Cash, cash equivalents and restricted cash, end of period 74,450,000 $ 43,005,000
Supplemental disclosures of cash flow information:    
Cash paid for taxes 38,000  
Supplemental disclosures of noncash activities:    
Operating lease liabilities arising from obtaining right-of-use assets $ 161,000