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Notes payable (Tables)
 6 Months Ended
Jun. 30, 2022
Notes payable with related parties [Abstract]  
Activity of the notes payable with related parties
2018 Related Notes and 2019 Executive Note
Related Party
Principal
Accrued
Interest
Balance
December 31, 2020
$
2,100
$
194
$
2,294
Accrued interest
—
19
19
Conversion
(2,000)
(205)
(2,205)
June 30, 2021
$
100
$
8
$
108
Schedule of Maturities of Notes Payable
Amount
2022
$
216
2023
444
2024
458
2025
9,552
$
10,670
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Table Text Block]
June 30,
December 31,
2022
2021
Principal
$
10,670
$
 
10,883
Unamortized debt issuance cost
(157)
(184)
Carrying amount
10,513
10,699
Less: current portion
(384)
(376)
Note payable, net of current portion and debt issuance cost
$
10,129
$
10,323