Revenue From Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 28,439	$ 23,445	$ 79,820	$ 64,966
Dayrate drilling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	27,552	22,125	75,776	61,369
Mobilization
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	331	619	1,061	1,586
Reimbursables
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	555	700	2,788	2,001
Capital modification
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	0	195	0
Other products and services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 1	$ 0	$ 10