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Commitments and Contingencies Capital Lease (Details) - Equipment
$ in Thousands
Dec. 31, 2016
USD ($)
Capital Leased Assets [Line Items]  
Capital leased assets $ 1,200
Capital lease, upfront payment 330
Capital leases, future minimum payments, present value of net minimum payments 874
Future minimum payments due, 2017 317
Future minimum payments due, 2018 317
Future minimum payments due, 2019 317
Accrued Liabilities  
Capital Leased Assets [Line Items]  
Future minimum payments due 275
Capital Lease Obligations  
Capital Leased Assets [Line Items]  
Future minimum payments due $ 599