Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net loss			$ (31,603)	$ (9,379)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense			4,636	450
Depreciation and amortization expense	$ 5	$ 4	13	13
Changes in operating assets and liabilities:
Prepaid expenses and other current assets			(2,781)	(41)
Accounts payable			3,689	(290)
Accrued expenses and other liabilities			4,259	361
Net cash used in operating activities			(21,787)	(8,886)
Cash flows from investing activities
Additions to property and equipment			(21)	(2)
Net cash used in investing activities			(21)	(2)
Cash flows from financing activities
Proceeds from issuance of convertible preferred stock, net of issuance costs			106,631
Proceeds from issuance of common stock for exercise of stock options			27
Payments of deferred offering costs			(1,128)
Net cash provided by financing activities			105,530
Net increase (decrease) in cash, cash equivalents and restricted cash			83,722	(8,888)
Cash, cash equivalents and restricted cash at the beginning of period			21,768	34,599
Cash, cash equivalents and restricted cash at the end of period	105,490	25,711	105,490	25,711
Cash, cash equivalents and restricted cash at the end of period
Cash and cash equivalents	105,383	25,604	105,383	25,604
Restricted cash	107	107	107	107
Cash, cash equivalents and restricted cash at the end of period	$ 105,490	$ 25,711	105,490	$ 25,711
Supplemental disclosure of noncash financing activities
Equity issuance costs included in accounts payable and accrued expenses			$ 394