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Subsequent Events (Details) - Subsequent Event [Member]
$ / shares in Units, $ in Millions
Mar. 28, 2018
USD ($)
Investor
$ / shares
shares
Subsequent Event [Line Items]  
Number of accredited investors | Investor 2
Shares issued through private placement (in shares) | shares 7,936,508
Share price (in dollars per share) | $ / shares $ 1.26
Gross proceeds from private placement | $ $ 10.0
Broadwood Partners, L.P [Member] | Minimum [Member]  
Subsequent Event [Line Items]  
Beneficial ownership percentage 5.00%
Investor One [Member]  
Subsequent Event [Line Items]  
Shares issued through private placement (in shares) | shares 6,349,206
Gross proceeds from private placement | $ $ 8.0
Investor Two [Member]  
Subsequent Event [Line Items]  
Shares issued through private placement (in shares) | shares 1,587,302
Gross proceeds from private placement | $ $ 2.0