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Prepaid expenses and other assets (Tables)
6 Months Ended
Jun. 30, 2023
Prepaid expenses and other assets  
Schedule of prepaid expenses and other current assets

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(in thousands)

    

June 30, 2023

    

December 31, 2022

Prepaid subscriptions and service contracts

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$

497

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$

876

Prepaid insurance

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​

271

​

​

158

CARES Act employee retention credit receivable

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​

208

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​

847

Research and development advance payments

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​

134

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​

445

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​

$

1,110

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$

2,326