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Investments and Fair Value Measurements - Schedule of Continuous Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, gross unrealized losses	$ (17)
Less than 12 months, fair value	38,009
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, gross unrealized losses	0
Less than 12 months, fair value	249
U.S. agency securities and government sponsored securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, gross unrealized losses	(16)
Less than 12 months, fair value	32,767
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, gross unrealized losses	(1)
Less than 12 months, fair value	$ 4,993

X

- Definition

Amount of accumulated unrealized loss on 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 less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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X

- Definition

Amount of accumulated unrealized loss on 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

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+ References

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