Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Prepaid Expenses Deposits And Other Current Assets
Advanced payments to service providers and suppliers	$ 651	$ 808
Prepaid insurance	1,174	1,856
Deposits	2,973	1,989
Deferred financing charges	1,014
EsoCheck cell collection supplies	266	434
EsoGuard mailer supplies	65	59
CarpX devices	33	33
Total prepaid expenses, deposits and other current assets	$ 6,176	$ 5,179