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Financings
 12 Months Ended
Dec. 31, 2018
Text Block [Abstract]  
Financings
2.
 
Financings
On November 
11
,
2018
, the Company entered into a securities purchase agreement with certain institutional and accredited investors pursuant to which the Company agreed to issue and sell to the Investors an aggregate
of 
18
,939,394
immediately separable units with each Unit being comprised of (i) one share of the Company’s common stock, par value $
0.001
per share and (ii) a warrant to purchase one share of common stock at a price per unit of $
2.64
,
for net proceeds of approximately $
47.1
 
million.
On May 11, 2017, the Company sold in an underwritten offering an aggregate of 9,708,738 shares of its common stock to a single investor. The price to the investor in the offering was $5.15 per share, and the underwriters agreed to purchase the shares from the Company pursuant to the underwriting agreement at a purchase price of $
4.893
per share. The net proceeds from the offering were approximately $47.3 million after deducting underwriting commissions and estimated offering expenses payable by the Company.