Commitments and Contingencies - Reorganization (Details) - Severance liability $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 3,280
Restructuring Reserve [Roll Forward]
Beginning balance	0
Expense	3,280
Cash Payments	(3,093)
Ending balance	$ 187

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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