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Cash Equivalents and Investments - Available for Sale securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 150,017	$ 61,009
Available-for-sale securities, unrealized gains	0	0
Available-for-sale securities, unrealized losses	(101)	(51)
Available-for-sale securities, fair value	149,916	60,958
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	31,749	46,133
Available-for-sale securities, unrealized gains	0	0
Available-for-sale securities, unrealized losses	(55)	(35)
Available-for-sale securities, fair value	31,694	46,098
Government notes
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	12,448	6,191
Available-for-sale securities, unrealized gains	0	0
Available-for-sale securities, unrealized losses	(18)	(16)
Available-for-sale securities, fair value	12,430	6,175
Asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	12,226
Available-for-sale securities, unrealized gains	0
Available-for-sale securities, unrealized losses	(28)
Available-for-sale securities, fair value	12,198
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	9,850	8,685
Available-for-sale securities, unrealized gains	0	0
Available-for-sale securities, unrealized losses	0	0
Available-for-sale securities, fair value	9,850	$ 8,685
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	83,744
Available-for-sale securities, unrealized gains	0
Available-for-sale securities, unrealized losses	0
Available-for-sale securities, fair value	$ 83,744

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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