Concentration of Credit Risk and Significant Customers (Tables)

3 Months Ended

Mar. 31, 2021

Significant customers are those that represent 10% or more of revenue or accounts receivable and are set forth in the following tables:


		As of March 31, 2021	As of December 31,
Accounts Receivable			2020	2019
Customer A		31.1%	49.3%	60.0%
Customer B		33.9%	31.9%	20.4%
Customer C		10.0%	*	*

	For the Three Months Ended March 31,		For the Year Ended December 31,
Revenue	2021	2020 (unaudited)	2020	2019
Customer A	27.3%	31.3%	59.6%	79.6%
Customer B	31.2%	53.2%	29.2%	13.3%

* Less than 10% of total