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Revenue (Tables)
3 Months Ended
Mar. 31, 2021
Revenue  
Schedule of amounts recorded in accrued liabilities

March 31, 

December 31,

2021

2020

Contract liabilities

$

(657)

$

(374)

During the three months ended March 31, 2021, the Company recognized $248,000 of revenue that was included in the contract balances as of December 31, 2020.