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Percentage of registrable securities owned for exercise of underwritten offerings

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Termination description of registration agreement.

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Threshold percentage of outstanding shares of common stock for termination of agreement.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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Related Party Transactions - Additional Information (Details) $ in Thousands				1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 30, 2020 shares	Feb. 28, 2020 USD ($) shares	May 10, 2018 Registration Offering	Aug. 31, 2018 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Related Party Transaction [Line Items]
Net of cash acquired							$ 296,966	$ 32,916
Legal fees incurred					$ 1,800	$ 500	3,400	1,600
Legal fees payable					3,200	1,000	3,200	1,000
Original Equity Registration Rights Agreement
Related Party Transaction [Line Items]
Fees incurred in conjunction with agreement						$ 100	200	$ 700
Apollo Funds \| Whistler Energy II, LLC \| Whistler Energy II Holdco, LLC
Related Party Transaction [Line Items]
Net of cash acquired				$ 14,800
Business acquisition, date of acquisition agreement				Aug. 31, 2018
Aggregate consideration of cash				$ 52,600
Available cash acquired				$ 37,800
Primary fair values of receivables acquired					$ 1,100		$ 1,100
Franklin Advisers, Inc. and MacKay Shields LLC \| Registration Rights Agreement
Related Party Transaction [Line Items]
Number of days required to file shelf registration statement			30 days
Number of demand registrations allowed in any twelve-month period \| Registration			2
Number of underwritten offerings to demand in any twelve-month period \| Offering			3
Number of underwritten offerings to demand \| Offering			1
Percentage of registrable securities owned, underwritten offerings			5.00%
Threshold percentage of outstanding shares of common stock for termination of agreement			5.00%
Registration agreement, termination description							The Registration Rights Agreement has terminated with respect to Franklin and will terminate with respect to MacKay Shields in the event that MacKay Shields ceases to beneficially own 5% or more of the then outstanding shares of the Company’s common stock. The Registration Rights Agreement will otherwise terminate at such time as there are no Registrable Securities outstanding.
ILX and Castex
Related Party Transaction [Line Items]
Assets and liabilities acquired at fair value							$ 453,166
Net of cash acquired							296,966
Aggregate consideration of cash							$ 385,000
ILX and Castex \| Talos Energy L L C Stakeholders
Related Party Transaction [Line Items]
Aggregate consideration of cash		$ 385,000
ILX and Castex \| Talos Energy L L C Stakeholders \| Series A Convertible Preferred Stock
Related Party Transaction [Line Items]
Aggregate shares issued \| shares	110,000	110,000
Shares issued upon conversion \| shares	11,000,000.0
ILX and Castex \| Riverstone Funds
Related Party Transaction [Line Items]
Assets and liabilities acquired at fair value		$ 453,200
Business combination, conversion stock		156,200
Net of cash acquired		$ 297,000