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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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-Publisher FASB
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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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), in continuous unrealized loss position for more than 12 months.

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No definition available.

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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), in unrealized loss position.

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No definition available.

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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No definition available.

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Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Total available-for-sale securities
Amortized Cost	$ 65,050		$ 65,050		$ 47,807
Gross Unrealized Gains	2		2
Gross Unrealized Losses	(29)		(29)		(27)
Estimated Fair Value	65,023		65,023		47,780
Available-for-sale securities in a loss position
Estimated Fair Value	33,991		33,991		44,781
Investments that had been in a continuous loss position for more than 12 months	0		0		0
Realized gains	0	$ 0	0	$ 0
Realized losses	0		0
U.S. treasuries
Total available-for-sale securities
Amortized Cost	44,501		44,501		33,914
Gross Unrealized Gains	1		1
Gross Unrealized Losses	(14)		(14)		(19)
Estimated Fair Value	44,488		44,488		33,895
Available-for-sale securities in a loss position
Estimated Fair Value	25,387		25,387		33,895
Corporate debt
Total available-for-sale securities
Amortized Cost	8,619		8,619		10,894
Gross Unrealized Losses	(15)		(15)		(8)
Estimated Fair Value	8,604		8,604		10,886
Available-for-sale securities in a loss position
Estimated Fair Value	8,604		8,604		10,886
Commercial paper
Total available-for-sale securities
Amortized Cost	11,930		11,930		2,999
Gross Unrealized Gains	1		1
Estimated Fair Value	$ 11,931		$ 11,931		$ 2,999