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Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Total available-for-sale securities
Amortized Cost			$ 85,863	$ 66,807
Gross Unrealized Gains			5
Gross Unrealized Losses			(15)	(20)
Estimated Fair Value			85,853	66,787
Available-for-sale securities in a loss position
Estimated Fair Value			49,773	43,788
Gross Unrealized Losses			(15)	(20)
Investments that had been in a continuous loss position for more than 12 months			0	0
Realized gains	$ 0	$ 0
U.S. treasuries
Total available-for-sale securities
Amortized Cost			58,816	40,013
Gross Unrealized Gains			3
Gross Unrealized Losses			(13)	(5)
Estimated Fair Value			58,806	40,008
Available-for-sale securities in a loss position
Estimated Fair Value			41,864	20,002
Gross Unrealized Losses			(13)	(5)
Government agency securities
Total available-for-sale securities
Amortized Cost				10,020
Gross Unrealized Losses				(8)
Estimated Fair Value				10,012
Available-for-sale securities in a loss position
Estimated Fair Value				10,012
Gross Unrealized Losses				(8)
Corporate debt
Total available-for-sale securities
Amortized Cost			10,912	13,780
Gross Unrealized Gains			1
Gross Unrealized Losses			(2)	(7)
Estimated Fair Value			10,911	13,773
Available-for-sale securities in a loss position
Estimated Fair Value			7,909	13,774
Gross Unrealized Losses			(2)	(7)
Commercial paper
Total available-for-sale securities
Amortized Cost			16,135	2,994
Gross Unrealized Gains			1
Estimated Fair Value			$ 16,136	$ 2,994

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- Definition

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

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

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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