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Stockholders' Equity (Deficit) (Tables)
 6 Months Ended
Jun. 30, 2019
Federal Home Loan Banks [Abstract]  
Summary of Preferred Stock Allocated to Investors The Purchase Agreement provides for the Company to issue and sell to the Investor shares of the Company’s preferred stock in the amounts set forth in the following table (numbers have been adjusted for the February 2016 reverse stock split):
 
Convertible Preferred Stock
 
Shares
 
 
Price

Per Share
 
 
Total

Investment
 
Series AA-1
 
 
8,427,004
 
 
$
12.00
 
 
$
101,124,048
 
Series AA-2
 
 
7,223,145
 
 
$
6.00
 
 
 
43,338,870
 
 
 
 
15,650,149
 
 
 
 
 
 
$
144,462,918