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Supplemental Financial Information - Prepaid expenses and other assets and Other assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other current assets:    
Prepaid expenses $ 1,169 $ 2,117
Inventory 16 189
Other 172 0
Other current assets 1,357 2,306
Other long-term assets:    
Deposits 263 414
Intangibles 696 1,941
Other long-term assets 323 341
Total $ 1,282 $ 2,696