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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Warrant Activity

The following table shows the warrant activity (in thousands):

 

 

Rollforward of Warrant Activity

 

 

Registered direct warrants, series A

 

 

Registered direct warrants, series B

 

 

Registered direct warrants, placement agent

 

 

Total

 

Balance as of January 1, 2019

—

 

 

—

 

 

—

 

 

—

 

Warrants issued

 

3,449,112

 

 

 

3,449,112

 

 

 

172,456

 

 

 

7,070,680

 

Warrants exercised

—

 

 

—

 

 

—

 

 

—

 

Warrants expired

—

 

 

—

 

 

—

 

 

—

 

Balance as of December 31, 2019

 

3,449,112

 

 

 

3,449,112

 

 

 

172,456

 

 

 

7,070,680