Summary of Significant Accounting Policies - Accounts Receivable and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Industry practice payment of receivables	20 days
Changes in the allowance for doubtful accounts [Roll Forward]
Balance at beginning of period	$ 114	$ 141	$ 153
Charges to costs and expenses	0	0	26
Deductions	(6)	(27)	(38)
Balance at end of period	$ 108	$ 114	$ 141
Credit Concentration Risk | Accounts Receivable | Crude Oil Marketing Activities
Concentration Risk [Line Items]
Concentration risk, percentage	87.00%