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Prepaid expenses and other assets (Tables)
6 Months Ended
Jun. 30, 2022
Prepaid expenses and other assets  
Schedule of prepaid expenses and other current assets

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(in thousands)

    

June 30, 2022

    

December 31, 2021

CARES Act employee retention credit receivable

​

$

847

​

$

—

Prepaid insurance

​

​

830

​

​

2,019

Research and development advance payments

​

​

501

​

​

586

Other prepaids and short-term deposits

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​

528

​

​

492

Reimbursement receivable from DoD

​

​

243

​

​

2,674

Unbilled reimbursement receivable from DoD

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—

​

 

1,638

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​

$

2,949

​

$

7,409