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Stockholders' Equity
9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Stockholders' Equity Stockholders’ Equity
Warrants
As of September 30, 2019, the following equity-classified warrants to purchase common stock were outstanding: 
NUMBER OF
UNDERLYING
SHARES
 
EXERCISE
PRICE PER
SHARE
 
WARRANT
EXPIRATION
DATE
75,000
 
$5.00
 
November 2019
4,500
 
$5.00
 
August 2020
223,481
 
$0.05
 
December 2019

The warrants outstanding as of September 30, 2019 are all currently exercisable. In October 2019, 298,481 warrants outstanding as of September 30, 2019 were exercised for shares of Aerie common stock.