Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of marketable securities

The realized gain or loss, unrealized gain or loss, and dividend income related to marketable securities for the three and nine months ended September 30, 2018 and 2017 are as follows ($ in thousands):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2018			2017			2018			2017
Realized gain (loss)	$	(86	)	$	(174	)	$	(361	)	$	(303	)
Unrealized gain (loss)		3			124			(14	)		262
Dividend income		44			18			121			72
	$	(39	)	$	(32	)	$	(254	)	$	31

Schedule of potentially dilute loss per share

Securities that could potentially dilute loss per share in the future that were not included in the computation of diluted loss per share at September 30, 2018 and 2017 are as follows: 

	As of September 30,
	2018		2017
Convertible preferred stock		2,926		2,926
Warrants to purchase common stock		1,249,754		1,251,709
Options to purchase common stock		528,490		328,716
Total		1,781,170		1,583,351