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Summary of Significant Accounting Policies - Summary of Fair Value Measurement Financial Asset and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Assets [Abstract] |  |
Cash and cash equivalents | $ 108,000 |
Restricted cash | 0 | $ 300
Total Assets | 250,831 | 26,346
Money Market Funds [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 62,353 | 26,046
U.S. Treasury Securities [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 9,348 |
Government-sponsored Enterprises [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 41,202 |
Corporate Debt Securities [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 137,928 |
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] |  |
Assets [Abstract] |  |
Restricted cash |  | 300
Total Assets | 62,353 | 26,346
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Money Market Funds [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 62,353 | 26,046
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 0 |
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Government-sponsored Enterprises [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 0 |
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Corporate Debt Securities [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 0 |
Significant Other Observable Inputs, Level 2 [Member] |  |
Assets [Abstract] |  |
Restricted cash |  | 0
Total Assets | 188,478 | 0
Significant Other Observable Inputs, Level 2 [Member] | Money Market Funds [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 0 | 0
Significant Other Observable Inputs, Level 2 [Member] | U.S. Treasury Securities [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 9,348 |
Significant Other Observable Inputs, Level 2 [Member] | Government-sponsored Enterprises [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 41,202 |
Significant Other Observable Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 137,928 |
Significant Unobservable Inputs, Level 3 [Member] |  |
Assets [Abstract] |  |
Restricted cash |  | 0
Total Assets | 0 | 0
Significant Unobservable Inputs, Level 3 [Member] | Money Market Funds [Member] |  |
Assets [Abstract] |  |
Cash and cash equivalents | 0 | $ 0
Significant Unobservable Inputs, Level 3 [Member] | U.S. Treasury Securities [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 0 |
Significant Unobservable Inputs, Level 3 [Member] | Government-sponsored Enterprises [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | 0 |
Significant Unobservable Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |
Assets [Abstract] |  |
Available-for-sale Securities, Current | $ 0 |

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- 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 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + 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=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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