Significant Customers and Geographic Data Revenues and Accounts Receivable by Customers (Details) - Customer Concentration Risk - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current Receivables | Customer B
Revenue, Major Customer [Line Items]
Accounts Receivable	$ 918
Current Receivables | Customer C
Revenue, Major Customer [Line Items]
Accounts Receivable	535	$ 677
Current Receivables | Customer D
Revenue, Major Customer [Line Items]
Accounts Receivable		550
Current Receivables | Customer E
Revenue, Major Customer [Line Items]
Accounts Receivable		$ 471
Revenue from Contract with Customer, Product and Service Benchmark | Customer A
Revenue, Major Customer [Line Items]
Revenues	$ 6,442