Commitments and Contingencies - Other Commitments (Details) - Supply Commitment [Member] $ in Thousands	Jun. 30, 2018 USD ($)
Other Commitments [Line Items]
Future Minimum Payment	$ 4,250
April 2016 [Member]
Other Commitments [Line Items]
Future Minimum Payment	1,693
April 2017 [Member]
Other Commitments [Line Items]
Future Minimum Payment	2
July 2017 [Member]
Other Commitments [Line Items]
Future Minimum Payment	439
December 2017 [Member]
Other Commitments [Line Items]
Future Minimum Payment	$ 2,116