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Discontinued Operations - Depreciation, Capital Expenditures, and Significant Operating and Investing Non-Cash Items Related to Discontinued Operations (Details) (Details) - USD ($)
$ in Thousands
 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]      
Proceeds from insurance recovery $ 0 $ 0 $ 216
Gain on insurance recovery 0 0 (165)
Stock-based compensation 1,210 3,023 1,201
Changes in deferred rent 1 (108) (187)
Impairment of fixed asset 0 0 51
Services Business | Discontinued Operations Held-for-sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Depreciation expense 0 391 1,132
Purchases of property and equipment 0 (547) (704)
Proceeds from insurance recovery 0 0 216
Gain on insurance recovery 0 0 (165)
Stock-based compensation 0 208 159
Changes in deferred rent 0 (133) (187)
Equipment purchases in accounts payable and accrued expenses 0 0 34
Impairment of fixed asset $ 0 $ 0 $ 51