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Summary of Significant Accounting Policies (Details)	6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) ft²
Fair value of assets measured at fair value on a recurring basis
Transfers of assets and liabilities between Level 1, Level 2, or Level 3	$ 0	$ 0
Area of lease of office and laboratory space (in sq ft) | ft²		23,578
Standby Letters of Credit
Fair value of assets measured at fair value on a recurring basis
Standby letter of credit	$ 2,400,000	$ 2,400,000.0

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Lessee Leasing Arrangements, Operating Leases, Area of Leased Property

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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