Debt - Par Pacific Term Loan Agreement (Details) - Term Loan - Par Pacific Term Loan - USD ($)	12 Months Ended
Dec. 31, 2019	Jan. 09, 2019
Debt Instrument [Line Items]
Debt instrument, face amount		$ 45,000,000
Gain (loss) on debt extinguishment and commitment costs	$ 100,000

Face (par) amount of debt instrument at time of issuance.

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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant