Long-term Debt - Narrative (Details)	1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 30, 2018 USD ($)	Apr. 30, 2016 USD ($)	Mar. 31, 2018 USD ($) rig_appraisal	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Jul. 14, 2017	Apr. 14, 2016 USD ($)	Oct. 31, 2015 USD ($)	Nov. 30, 2014 USD ($)
Debt Instrument [Line Items]
Number of rig appraisals, annually | rig_appraisal			2
Aggregate borrowings			$ 54,397,000		$ 49,811,000
Capital lease obligations recorded, reclassification from operating leases				$ 800,000
Capital leases, term (months)				36 months
Revolving credit facility | Line of credit
Debt Instrument [Line Items]
Borrowing limit based on eligible trade accounts (as a percent)			85.00%
Eligible trade accounts receivable days outstanding limit (not more than)			90 days
Borrowing limit based on appraised forced liquidation of eligible completed and owned drilling rigs (up to) (as a percent)			72.50%
Interest rate, basis spread based on availability (as a percent)			3.50%
Commitment fee on unused capacity (as a percent)			0.50%
Weighted average interest rate on borrowings (as a percent)			6.35%
Line of credit facility, higher borrowing capacity option			$ 20,000,000.0
Line of credit facility, springing lock box arrangement, threshold							$ 10,000,000.0
Aggregate borrowings			53,220,000		$ 48,541,000
Borrowing base			$ 31,800,000
Revolving credit facility | Line of credit | LIBOR
Debt Instrument [Line Items]
Interest rate, basis spread (as a percent)			4.50%
Revolving credit facility | Line of credit | Three-month LIBOR
Debt Instrument [Line Items]
Interest rate, basis spread (as a percent)			1.00%
Revolving credit facility | Line of credit | Federal funds, effective rate
Debt Instrument [Line Items]
Interest rate, basis spread (as a percent)			0.05%
Revolving credit facility | Line of credit | CIT Finance, LLC syndicate
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity		$ 85,000,000.0						$ 125,000,000.0	$ 155,000,000.0
Deferred debt issuance costs expensed		$ 500,000
Additional term from extension					2 years
Decrease borrowing limit quarterly (as a percent)						1.25%
Maximum amount of previously capitalized construction costs added back to EBITDA			$ 2,000,000.0
Revolving credit facility | Line of credit | CIT Finance, LLC syndicate | Accordion feature
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity					$ 65,000,000.0				$ 25,000,000.0
Minimum | Revolving credit facility | Line of credit
Debt Instrument [Line Items]
Borrowing limit based on appraised forced liquidation of eligible completed and owned drilling rigs (up to) (as a percent)						65.00%
Subsequent Event | Revolving credit facility | Line of credit | CIT Finance, LLC syndicate
Debt Instrument [Line Items]
Debt instrument, capital expenditures excluded from fixed charge coverage ratio	$ 13,000,000