Summary of Significant Accounting Policies, Trade Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trade Accounts Receivable [Abstract]
Allowance for doubtful accounts associated with accounts receivable	$ 40	$ 124	$ 58
Minimum [Member]
Trade Accounts Receivable [Abstract]
Trade receivables, period for credit term	30 days
Maximum [Member]
Trade Accounts Receivable [Abstract]
Trade receivables, period for credit term	60 days