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Warrants - Warrants Issued with Series A Preferred Stock - Additional Information (Details) - 2017 Warrants - Warrants Issued with Series A Preferred Stock
$ / shares in Units, $ in Millions
Jan. 26, 2017
USD ($)
$ / shares
shares
Warrants  
Issuance of warrants (in shares) | shares 309,389
Issuance of warrants (in dollars) | $ $ 0.2
Exercise price (in dollars per share) | $ / shares $ 2.49