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Commitments and Contingencies - Commercial Supply Commitments - Recorded Purchase Commitments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Accrual for non-cancellable purchase commitments    
Purchase Commitment Write-down   $ 1,353
Commercial Supply Commitments    
Accrual for non-cancellable purchase commitments    
Purchase Commitment Write-down $ 1,300