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Supplemental Financial Information - Other Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Other current liabilities:    
Accrued interest $ 49 $ 618
Accrued losses on equipment contracts 104 183
Taxes payable 754 244
Dividends Payable 5,237 0
Deferred revenue 45 76
Warranty liabilities 601 287
Deferred rent 0 369
Asset retirement obligation 527 1,312
Other 891 928
Other current liabilities 8,208 4,017
Other long-term liabilities:    
Deferred rent 203 38
Deferred revenue, related party 2,000 2,000
Dividends payable 31 0
Other long-term liabilities $ 2,234 $ 2,038