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Marketable Securities and Fair Value Measurements - Securities in Unrealized Loss Position (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Continuous loss position, fair value	$ 58,922,000	$ 53,351,000
Continuous loss position, Unrealized losses	(60,000)	(64,000)
Continuous loss position, fair value, more than 12 months	0
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Continuous loss position, fair value	3,493,000
Continuous loss position, Unrealized losses	(7,000)
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Continuous loss position, fair value	32,236,000	28,537,000
Continuous loss position, Unrealized losses	(32,000)	(42,000)
U.S. Treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Continuous loss position, fair value	5,181,000	5,176,000
Continuous loss position, Unrealized losses	(10,000)	(14,000)
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Continuous loss position, fair value	5,482,000	8,974,000
Continuous loss position, Unrealized losses	0	(2,000)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Continuous loss position, fair value	12,530,000	10,664,000
Continuous loss position, Unrealized losses	$ (11,000)	$ (6,000)

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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