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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of Equity Classified Warrants Outstanding
As of June 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
223,482
 
$0.05
 
December 2019