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Concentrations of Credit and Other Risks
 12 Months Ended
Dec. 31, 2021
Risks and Uncertainties [Abstract]  
Concentrations of Credit and Other Risks Concentrations of Credit and Other Risks
The following customers accounted for 10% or more of our revenues for the periods presented:
Year Ended December 31,
202120202019
Quick Laser Technology Co., Ltd.
(1)
12%11%
Raytheon Technologies
(1)
12%13%
U.S. Government22%15%
(1)
(1)
(1) Represents less than 10% of total revenues
Financial instruments that potentially expose us to concentrations of credit risk consist principally of accounts receivable. As of December 31, 2021 and 2020, two customers accounted for approximately 33% and 43%, respectively, of net accounts receivable. No other customers accounted for 10% or more of net accounts receivable at either date.