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Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
Potentially dilutive securities include the following:
 
March 31,
 
2019
 
2018
 
(in thousands)
Options to purchase Common Stock
4,444

 
2,863

Warrants to purchase Common Stock
49

 
49

Total
4,493

 
2,912