Contingencies and Commitments - Additional Information (Details)		1 Months Ended		12 Months Ended
	Jan. 19, 2018 USD ($)	Mar. 29, 2018 USD ($) Well	Feb. 28, 2018 USD ($) Well	Dec. 31, 2017 USD ($) Drilling_Rig	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Building rent expense				$ 439,000	$ 375,000
Relocation period				2018-02
Number of drilling rigs under contract | Drilling_Rig				1
Drilling Rig
Loss Contingencies [Line Items]
Operating lease expiration date				Jul. 19, 2018
Aggregate drilling rate				$ 18,500
Early termination fee percentage				80.00%
Drilling rig termination fee description				The early termination fee equals 80% of the daily drilling rate times the number of days remaining on the contract term, which was approximately $2.7 million as of December 31, 2017.
Drilling rig remaining commitment				$ 2,700,000
Drilling Rig | Subsequent Event
Loss Contingencies [Line Items]
Aggregate drilling rate	$ 18,750		$ 20,000
Drilling rig termination fee description			The early termination fee equals the greater of demobilization costs or $200,000, plus $200,000 for each undrilled well.
Number of wells to be drilled under additional rig contract | Well			4
Operating lease commencing month and year			2018-04
Early termination fee amount			$ 200,000
Early termination fee amount for each undrilled well			$ 200,000
Hydraulic Fracturing And Wireline Services | Subsequent Event
Loss Contingencies [Line Items]
Operating lease expiration date		Dec. 31, 2018
Early termination fee amount		$ 133,000
Number of scheduled wells that is not hydraulically fractured as of termination date | Well		15