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Investments and Fair Value Measurements - Schedule of Marketable Investments (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Cost	$ 108,149
Gross Unrealized Gains	8
Gross Unrealized Losses	(17)
Fair Value	108,140
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Cost	4,156
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Fair Value	4,157
U.S. treasury
Debt Securities, Available-for-sale [Line Items]
Cost	989
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	989
U.S. agency securities and government sponsored securities
Debt Securities, Available-for-sale [Line Items]
Cost	94,879
Gross Unrealized Gains	7
Gross Unrealized Losses	(16)
Fair Value	94,870
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cost	3,131
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	3,131
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cost	4,994
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Fair Value	$ 4,993

X

- Definition

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
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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