Securities Sold, Not Yet Purchased - At Fair Value  | 
3 Months Ended | 
|---|---|
Jun. 30, 2018  | |
| Securities Sold Not Yet Purchased - At Fair Value | |
| Securities Sold, Not Yet Purchased - At Fair Value | 
 As of June 30, 2018, and March 31, 2018, the Company’s securities sold, not yet purchased – at fair value was $1,756 and $1,135 respectively. 
 During the quarter ended June 30, 2018, the Company sold shares received as a pledge under reverse repurchase agreements and recognized financial liabilities at fair value in the amount of $6,996, and partially closed short position in the amount of $5,216 by purchasing securities from a third party, reducing the financial liability. During the quarter ended June 30, 2018, the Company recognized a gain on the change in fair value of financial liabilities at fair value through the Consolidated Statements of Operations and Statements of Other Comprehensive Income/(Loss) in the amount of $956 with a foreign exchange translation gain of $203. 
 A short sale involves the sale of a security that is not owned in the expectation of purchasing the same security (or a security exchangeable) at a later date at a lower price. A short sale involves the risk of a theoretically unlimited increase in the market price of the security that would result in a theoretically unlimited loss. 
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