(in thousands)

Three months ended
September 30,

Nine months ended
September 30,

2018

2017

2018

2017

Cost of marketable equity securities sold

$ -

$50

$ -

$ 88

Realized gain on marketable equity securities sold

-

357

-

578

Proceeds from the sale of marketable equity securities sold

-

(407)

-

(666)

Purchase of marketable equity securities

-

1,052

-

1,528

Gross unrealized (loss) gain recorded in the statement of operations

(74)

157

(737)

618

Change in marketable equity securities at fair value

$(74)

$ 802

$(737)

$ 1,480