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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Summary of Warrant Activity A summary of warrant activity is as follows:

Number of
Shares
 
Weighted
Average
Exercise Price
Outstanding — December 31, 2016
445,000

 
$
6.78

Outstanding — December 31, 2017
445,000

 
6.78

Exercised
(445,000
)

6.78

Outstanding — December 31, 2018
—

 
$
—
Schedule of Stock by Class
Description of Financing Transaction

No. of Common Shares Issued
 
 Proceeds Received (Net of Broker Commissions and Fees )
Common shares issued pursuant to the December 2015 ATM Agreement between July 1, 2017 and July 31, 2017
 
3,243,882

 
$
23,745

Common shares issued pursuant to the August 2017 ATM Agreement between August 1, 2017 and December 31, 2017
 
10,314,250

 
$
104,527

Common shares issued pursuant to the April 2019 ATM Agreement during the year ended December 31, 2019
 
221,529

 
$
1,814