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Basic and Diluted Net Loss per Share (Tables)
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Summary of Potential Common Shares
Potential common shares not included in calculating diluted net loss per share are as follows:
 
December 31
 
2019
 
2018
Stock options
1,830,958

 
1,529,964

Stock warrants
2,071,172

 
333,034

Nonvested restricted stock units
443,927

 
382,098

Total
4,346,057

 
2,245,096