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Summary of Significant Accounting Policies (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2015 USD ($) | May 31, 2014 USD ($) | Mar. 31, 2013 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2016 USD ($) segment item | Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) | Dec. 31, 2012 USD ($) | Mar. 31, 2013
Fair Value Measurements |  |  |  |  |  |  |  |  |
Number Of Operating Segments | segment |  |  |  |  | 1 |  |  |  |
Assets measured at fair value levels 2 or 3 |  |  |  |  | $ 0 | $ 0 |  |  |
Liabilities measured at fair value levels 2 or 3 |  |  |  |  | 0 | 0 |  |  |
Carrying value of cash held in money market fund |  |  |  |  | $ 38,000,000 | $ 45,500,000 |  |  |
Impairment of Long-Lived Assets |  |  |  |  |  |  |  |  |
Number of long-lived assets determined to be impaired | item |  |  |  |  | 0 | 0 |  |  |
Assets held for sale |  |  |  |  | $ 0 | $ 0 |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |
Expected term |  |  |  |  | 6 years 3 months |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |
Expected term |  |  |  |  | 10 years |  |  |  |
Pfizer | License Agreement |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
Milestone revenue | $ 20,000,000 | $ 15,000,000 |  |  | $ 0 | $ 20,000,000 | $ 15,000,000 |  |
Number of milestones met | item |  |  |  |  | 0 |  |  |  |
Pfizer | License Agreement | Up-Front Payment Arrangement |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |
Upfront payment revenue recognized |  |  | $ 22,500,000 | $ 22,500,000 |  |  |  | $ 22,500,000 |
Recognition period of up-front payment |  |  |  |  |  |  |  |  | 1 year 6 months

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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=66048111&loc=d3e19207-110258 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: 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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