Property and equipment (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2015	Jul. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,865
Less: accumulated depreciation	(259)
Property and equipment, net	4,606
Selling, general, and administrative expenses
Property, Plant and Equipment [Line Items]
Depreciation expense	300
Predecessor
Property, Plant and Equipment [Line Items]
Property and equipment, gross			$ 6,134
Less: accumulated depreciation			(2,000)
Property and equipment, net			4,134
Predecessor | Selling, general, and administrative expenses
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 500	600	$ 1,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 380
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	13 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	20 years
Leasehold improvements | Predecessor
Property, Plant and Equipment [Line Items]
Property and equipment, gross			462
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,946
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	15 years
Equipment | Predecessor
Property, Plant and Equipment [Line Items]
Property and equipment, gross			5,118
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 539
Construction in progress | Predecessor
Property, Plant and Equipment [Line Items]
Property and equipment, gross			$ 554