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Short-Term Investments - Schedule of Marketable Debt Securities (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Unrealized gains	[1]
US Treasury Bond [Member]
Amortized Cost		2,496
Unrealized gains
Realized gains
Fair value		2,496
Total Short-term Investments [Member]
Amortized Cost		2,496
Unrealized gains
Realized gains
Fair value		$ 2,496
[1] Less than 1

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- Definition

Marketable securities amortized cost.

+ References

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- Definition

Marketable securities fair value.

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- Definition

Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

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- Definition

Amount of unrealized gain (loss) on investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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