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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 31, 2015	Mar. 31, 2013
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	$ 121,151	$ 252,737
Investment in non-marketable security
Impairment of Investment in non-marketable equity security	0	0	$ 600
Available-for-sale Securities, Gross Unrealized Gain (Loss)				$ 1,264
Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	10,681	77,804
US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	48,292	14,110
Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	62,178	160,823
Fair Value, Measurements, Recurring [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	121,151	252,737
Fair Value, Measurements, Recurring [Member] | Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	10,681	77,804
Fair Value, Measurements, Recurring [Member] | US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	48,292	14,110
Fair Value, Measurements, Recurring [Member] | Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	62,178	160,823
Fair Value, Measurements, Recurring [Member] | Level 1
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	10,984	79,068
Fair Value, Measurements, Recurring [Member] | Level 1 | Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	10,681	77,804
Fair Value, Measurements, Recurring [Member] | Level 1 | US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 | Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	303	1,264
Fair Value, Measurements, Recurring [Member] | Level 2
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	110,167	173,669
Fair Value, Measurements, Recurring [Member] | Level 2 | Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 | US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	48,292	14,110
Fair Value, Measurements, Recurring [Member] | Level 2 | Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	61,875	159,559
Fair Value, Measurements, Recurring [Member] | Level 3
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 | Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 | US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 | Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	$ 0	$ 0
Nonrecurring basis
Investment in non-marketable security
Carrying Value					$ 2,000
Impairment of Investment in non-marketable equity security			$ 600

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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