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Discontinued Operations - Option Agreement Cash Flow (Details) - Discontinued Operations, Held-for-sale or Disposed of by Sale - Pessac Business - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Capital expenditures $ 0 $ 0 $ 1,271,000
Depreciation and amortization 0 0 1,709,000
Operating and investing non-cash elements $ 0 $ 0 $ (740,000)