Commitments and Contingencies - Other Commitments (Details) - Supply Commitment [Member] $ in Thousands	Jun. 30, 2019 USD ($)
Other Commitments [Line Items]
Future Minimum Payment	$ 1,432
April 2016 [Member]
Other Commitments [Line Items]
Future Minimum Payment	1,269
December 2017 [Member]
Other Commitments [Line Items]
Future Minimum Payment	$ 163

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant