Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Assets and Liabilities - Narrative (Details)

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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]    
Securities owned deposited with the Company's subsidiaries clearing broker $ 6,489 $ 9,763
Securities owned, at fair value 7,967 10,923
Common Stock and Warrants | Warrants to purchase common stock | Level 2    
Debt and Equity Securities, FV-NI [Line Items]    
Securities owned, at fair value $ 1,396 $ 1,052