Summary of Significant Accounting Policies - Warrants (Details) - Common stock warrants - $ / shares	Sep. 30, 2018	Feb. 28, 2015
Warrants \| Oxford Finance LLC
Warrants
Common stock that can be purchased with warrants (in shares)	62,505
Exercise price of warrants (in dollars per share)	$ 6.00
Warrants \| Hercules Capital, Inc.
Warrants
Common stock that can be purchased with warrants (in shares)	180,274	180,274
Exercise price of warrants (in dollars per share)	$ 5.89	$ 5.89

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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+ References

No definition available.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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