Net Loss Per Share Attributable to Common Stockholders- Excluded From Calculation (Details) - shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Outstanding common stock equivalents have been excluded from diluted net loss per common share
Outstanding common stock equivalents have been excluded from diluted net loss per common share (in shares)	8,801,432	2,233,926
Options issued and outstanding
Outstanding common stock equivalents have been excluded from diluted net loss per common share
Outstanding common stock equivalents have been excluded from diluted net loss per common share (in shares)	2,440,851	1,464,265
Warrants
Outstanding common stock equivalents have been excluded from diluted net loss per common share
Outstanding common stock equivalents have been excluded from diluted net loss per common share (in shares)	6,339,792	748,872
RSUs
Outstanding common stock equivalents have been excluded from diluted net loss per common share
Outstanding common stock equivalents have been excluded from diluted net loss per common share (in shares)	20,789	20,789