Preferred Stock and Common Stock Warrants - Beneficial Conversion Feature (Details) - Series A Convertible Preferred stock - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Preferred Stock and Common Stock Warrants
Deemed dividends - accretion of beneficial conversion feature - temporary equity	$ 551	$ 0
BCF
Preferred Stock and Common Stock Warrants
Accretion of stock discount as a deemed dividend	$ 2,500

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