Summary of Significant Accounting Policies - Trade Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ 40	$ 40	$ 124
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables, period for credit term	30 days
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables, period for credit term	60 days