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Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Total available-for-sale securities
Amortized Cost			$ 97,167	$ 66,807
Gross Unrealized Losses			(81)	(20)
Estimated Fair Value			97,086	66,787
Available-for-sale securities in a loss position
Estimated Fair Value			97,086	43,788
Gross Unrealized Losses			(81)	(20)
Investments that had been in a continuous loss position for more than 12 months			0	0
Realized gains	$ 0	$ 0
Amortized costs of contractual maturities of available-for-sale securities
Due in one year or less			72,278
Due after one year through two years			24,889
Amortized Cost			97,167	66,807
Estimated fair value of contractual maturities of available-for-sale securities
Due in one year or less			72,220
Due after one year through two years			24,866
Estimated Fair Value			97,086	66,787
U.S. treasuries
Total available-for-sale securities
Amortized Cost			34,986	40,013
Gross Unrealized Losses			(35)	(5)
Estimated Fair Value			34,951	40,008
Available-for-sale securities in a loss position
Estimated Fair Value			34,951	20,002
Gross Unrealized Losses			(35)	(5)
Amortized costs of contractual maturities of available-for-sale securities
Amortized Cost			34,986	40,013
Estimated fair value of contractual maturities of available-for-sale securities
Estimated Fair Value			34,951	40,008
Government agency securities
Total available-for-sale securities
Amortized Cost			62,181	10,020
Gross Unrealized Losses			(46)	(8)
Estimated Fair Value			62,135	10,012
Available-for-sale securities in a loss position
Estimated Fair Value			62,135	10,012
Gross Unrealized Losses			(46)	(8)
Amortized costs of contractual maturities of available-for-sale securities
Amortized Cost			62,181	10,020
Estimated fair value of contractual maturities of available-for-sale securities
Estimated Fair Value			$ 62,135	10,012
Corporate debt
Total available-for-sale securities
Amortized Cost				13,780
Gross Unrealized Losses				(7)
Estimated Fair Value				13,773
Available-for-sale securities in a loss position
Estimated Fair Value				13,774
Gross Unrealized Losses				(7)
Amortized costs of contractual maturities of available-for-sale securities
Amortized Cost				13,780
Estimated fair value of contractual maturities of available-for-sale securities
Estimated Fair Value				13,773
Commercial paper
Total available-for-sale securities
Amortized Cost				2,994
Estimated Fair Value				2,994
Amortized costs of contractual maturities of available-for-sale securities
Amortized Cost				2,994
Estimated fair value of contractual maturities of available-for-sale securities
Estimated Fair Value				$ 2,994

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- Definition

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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 loss 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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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount of available-for-sale debt securities at fair value maturing in the first fiscal year through the second fiscal year following the latest fiscal year.

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