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Commitments and Contingencies - Legal Proceedings (Details) $ in Thousands		9 Months Ended
	Mar. 09, 2015 USD ($)	Sep. 30, 2019 USD ($)	Aug. 31, 2019 action
Loss Contingencies [Line Items]
Stockholder derivative actions \| action			3
Minimum \| NY Lanham Act Litigation
Loss Contingencies [Line Items]
Amount in damages (more than)	$ 250,000
Pending Litigation \| Milbeck Federal Securities Litigation
Loss Contingencies [Line Items]
Agreement to settle		$ 28,250
Loss Contingency, Accrual, Current		$ 28,250