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Net Loss Per Common Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share
Total common stock equivalents (in shares)	6,468,116	6,417,696	6,461,659	6,226,855
Shares of common stock subject to outstanding options (in shares)
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share
Total common stock equivalents (in shares)	5,995,401	6,322,215	6,065,250	6,134,966
Employee stock purchase plan (in shares)
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share
Total common stock equivalents (in shares)	27,117	25,481	32,513	31,944
Restricted stock units (in shares)
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share
Total common stock equivalents (in shares)	445,598	70,000	363,896	59,945

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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+ References

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