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Marketable Securities and Fair Value Measurements - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financial Assets
Cash and Cash Equivalents	$ 28,632	$ 98,117
Marketable Securities	85,069	0
Total	113,701	98,117
Level I
Financial Assets
Cash and Cash Equivalents	1,330	71,081
Total	1,330	71,081
Fair Value, Inputs, Level 2 [Member]
Financial Assets
Marketable Securities	85,069	0
Total	85,069	0
Cash
Financial Assets
Cash and Cash Equivalents	27,302	27,036
Total	27,302	27,036
Money Market Funds | Level I
Financial Assets
Cash and Cash Equivalents	1,330	71,081
Total	1,330	71,081
Certificates of deposit
Financial Assets
Marketable Securities	9,001
Certificates of deposit | Fair Value, Inputs, Level 2 [Member]
Financial Assets
Marketable Securities		0
Total	9,001	0
Corporate securities
Financial Assets
Marketable Securities	35,966
Corporate securities | Fair Value, Inputs, Level 2 [Member]
Financial Assets
Marketable Securities		0
Total	35,966	0
Commercial paper
Financial Assets
Marketable Securities	23,401
Commercial paper | Fair Value, Inputs, Level 2 [Member]
Financial Assets
Marketable Securities		0
Total	23,401	0
Asset-backed securities
Financial Assets
Marketable Securities	16,701
Asset-backed securities | Fair Value, Inputs, Level 2 [Member]
Financial Assets
Marketable Securities		0
Total	$ 16,701	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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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
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6506951

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