Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Revenue

Schedule of amounts recorded in accrued liabilities

	June 30,		December 31,
	2021		2020
Contract liabilities	$	(258)	$	(374)
During the three and six months ended June 30, 2021, the Company recognized $12,000 and $260,000 of revenue that was included in the contract balances as of December 31, 2020.