Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Financial Statements Detail - Additional Information 2 (Details)

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Condensed Consolidated Financial Statements Detail - Additional Information 2 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Line Items]      
Total proceeds from sale of equipment and disposal of certain equipment   $ 1,614 $ 45
Total carrying value of equipment sold and disposed $ 100 500  
Other Income (Expense) [Member]      
Property, Plant and Equipment [Line Items]      
Gain (loss) on sale and disposal of equipment $ (100) $ 1,100