Prepaid Expenses and Other Current Assets (Tables)

6 Months Ended

Jun. 30, 2022

Prepaid Expenses And Other Current Assets [Abstract]

Schedule of prepaid expenses and other current assets

Prepaid expenses and other current assets as of June 30, 2022 and December 31, 2021 were as follows:

	June 30,		December 31,
(in thousands)	2022		2021
Australia research and development credit receivable	$	2,149	$	1,564
Metals to be used in research and development		1,623		2,237
Other		1,422		404
Total prepaid expenses and other current assets	$	5,194	$	4,205