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Stockholders' Equity - September 2018 Rights Offering - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended
Sep. 30, 2018
Feb. 28, 2018
Stockholders Equity Note [Abstract]    
Sale of common stock, net of expenses (in shares) 4,667,811 424,000
Net proceeds from issuance of common stock $ 7.0