Prepaid Expenses And Other Current Assets & Patents And Intangible Assets - Schedule of Prepaid Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Prepaid income taxes	$ 5,429	$ 0
Other prepaid expenses and other current assets	1,151	765
Total	$ 6,580	$ 765

Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_PrepaidTaxes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant