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Accrued Liabilities
 6 Months Ended
Jun. 30, 2021
Accrued Liabilities [Abstract]  
Accrued Liabilities Accrued Liabilities
Accrued liabilities as of June 30, 2021 and December 31, 2020 were as follows (in thousands):
June 30, 2021December 31, 2020
Salaries, employee benefits and related taxes$1,389 $1,716 
Operating lease liabilities — current366 370 
Other859 400 
Total$2,614 $2,486