Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (3,898)	$ (2,677)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	176	163
Share-based compensation	325	146
Deferred rent	(1)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(1,703)	99
Accounts payable	1,771	314
Accrued expenses and other current liabilities	(205)	(109)
Net cash used in operating activities	(3,535)	(2,064)
Cash flows from investing activities:
Purchases of property and equipment	(31)	(55)
Net cash used in investing activities	(31)	(55)
Cash flows from financing activities:
Proceeds from sale of Series A convertible preferred stock		995
Proceeds from exercise of stock options	6
Proceeds from exercise of common stock warrants	105
Payment of equipment loan payable	(35)	(55)
Payment of capital lease obligations		(96)
Net cash provided by financing activities	76	844
Net decrease in cash and restricted cash	(3,490)	(1,275)
Cash and restricted cash at beginning of year	39,866	2,643	$ 2,643
Cash and restricted cash at end of year	36,376	1,368	$ 39,866
Supplemental disclosures of cash flow information:
Cash paid for interest	$ 2	$ 13