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Available-for-Sale-Securities - Schedule of Available-for-Sale Securities Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cost	$ 30,753	$ 37,850
Gross Unrealized Gains	3	0
Gross Unrealized Losses	(3)	(32)
Estimated Fair Value	30,753	37,818
Money Market Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	8,852	4,314
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	8,852	4,314
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	21,901	33,536
Gross Unrealized Gains	3	0
Gross Unrealized Losses	(3)	(32)
Estimated Fair Value	$ 21,901	$ 33,504

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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