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Supplemental Financial Information - Other Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other current liabilities:    
Accrued consultant incentives $ 0 $ 369
Accrued interest 618 1,042
Accrued losses on equipment contracts 183 759
Taxes payable 244 521
Deferred revenue 76 682
Warranty liabilities 287 1,197
Deferred rent 369 0
Asset retirement obligation 1,312 1,248
Other 928 1,577
Other current liabilities 4,017 7,395
Other long-term liabilities:    
Deferred rent 38 767
Advance deposit, related party 0 2,981
Deferred revenue, related party 2,000 2,000
Other long-term liabilities 0 2,604
Total other long-term liabilities $ 2,038 $ 8,352