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Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]  
Summary of financial information has been segregated from continuing operations
The following summarized financial information has been segregated from continuing operations and reported as Discontinued Operations for the three and six months ended June 30, 2017 (in thousands):
 
Three months ended June 30, 2017
 
Six months ended June 30, 2017
Drilling Technologies
 
 
 
Revenue
$
4,737

 
$
11,534

Cost of revenue
(2,603
)
 
(7,259
)
Selling, general and administrative
(2,740
)
 
(5,771
)
Research and development
(6
)
 
(6
)
(Loss) gain on disposal of long-lived assets
(12
)
 
62

Loss from operations
(624
)
 
(1,440
)
Other expense
(46
)
 
(117
)
Loss on sales of businesses
(1,365
)
 
(1,365
)
Loss on write-down of assets held for sale
(272
)
 
(6,831
)
Loss before income taxes
(2,307
)
 
(9,753
)
Income tax benefit
158

 
3,147

Net loss from discontinued operations
$
(2,149
)
 
$
(6,606
)
 
 
 
 
Production Technologies
 
 
 
Revenue
$
849

 
$
4,002

Cost of revenue
(707
)
 
(3,189
)
Selling, general and administrative
(802
)
 
(1,675
)
Research and development
(92
)
 
(363
)
Loss from operations
(752
)
 
(1,225
)
Other expense
(16
)
 
(52
)
Gain on sale of businesses
171

 
171

Loss on write-down of assets held for sale
—

 
(9,718
)
Loss before income taxes
(597
)
 
(10,824
)
Income tax benefit
42

 
3,493

Net loss from discontinued operations
$
(555
)
 
$
(7,331
)
 
 
 
 
Drilling Technologies and Production Technologies
 
 
 
Loss from discontinued operations, net of tax
$
(2,704
)
 
$
(13,937
)
The assets classified as held for sale at June 30, 2018 and December 31, 2017 are as follows (in thousands):
 
June 30, 2018
 
December 31, 2017
Property and equipment, net
$
4,830

 
$
4,998

Valuation allowance
(2,580
)
 
—

Assets held for sale, net
$
2,250

 
$
4,998