Accounts Receivable

6 Months Ended

Jun. 30, 2021

Receivables [Abstract]

Accounts Receivable

3. Accounts Receivable

Accounts receivables consist of the following at:

(Dollars in thousands)	June 30, 2021		December 31, 2020
U.S. and State Government	$	53	$	2
Commercial		638		909
Other		89		64
Total	$	780	$	975

For the three months ended June 30, 2021 and 2020, the largest commercial customer represented 14.2% and 7.1%, respectively, and the largest governmental agency represented 35.5% and 65.8%, respectively, of the Company’s product revenue. For the six months ended June 30, 2021 and 2020, the largest commercial customer represented 12.7% and 9.6%, respectively, and the largest governmental agency represented 27.3% and 42.3%, respectively, of the Company’s product revenue. As of June 30, 2021 and December 31, 2020, the largest commercial customer receivable represented 16.4% and 15.9%, respectively, and the largest governmental customer receivable represented 6.8% and 0.3%, respectively, of the Company’s accounts receivable. 

The Company's allowance for doubtful accounts was $0 at both June 30, 2021 and December 31, 2020.