Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net loss	$ (8,146)	$ (8,946)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	7	7
Change in fair value of warrant liabilities		209
Stock compensation expense	537	125
Changes in assets and liabilities:
Receivables		10
Prepaid expenses and other current assets	(1,140)	265
Other assets		10
Accounts payable	246	(543)
Accrued expenses and other current liabilities	99	(1,979)
Deferred revenue	(113)	(113)
Net cash used in operating activities	(8,510)	(10,955)
Financing activities:
Proceeds from the sale of common stock and warrants, net of costs		35,147
Proceeds from the exercise of common warrants		480
Proceeds from the exercise of stock options		24
Net cash provided by financing activities		35,651
Effect of foreign currency translation on cash	(27)	(12)
Net (decrease) increase in cash and cash equivalents	(8,537)	24,684
Cash and cash equivalents at beginning of period	55,070	19,025
Cash and cash equivalents at end of period	$ 46,533	$ 43,709