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Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accumulated other comprehensive income/(loss)
Balances, beginning of period	$ 40,525	$ 27,065
Balances, end of period	29,083	40,525
Accumulated other comprehensive income/(loss) net of tax
Balances, beginning of period	40,525	27,065
Balances, end of period	29,083	40,525
Accumulated Other Comprehensive Income/(Loss) [Member]
Accumulated other comprehensive income/(loss)
Balances, beginning of period	15	(35)
Balances, end of period	(2)	15
Accumulated other comprehensive income/(loss) net of tax
Balances, beginning of period	15	(35)
Balances, end of period	(2)	15
Accumulated due to realization of gain/(loss) on marketable securities [Member]
Accumulated other comprehensive income/(loss)
Other comprehensive (gain) loss loss due to change in fair market value of marketable securities during period before reclassifications	(17)	50
Accumulated other comprehensive income/(loss) net of tax
Other comprehensive loss due to change in fair market value of marketable securities during period before reclassifications	(14)	43
Accumulated other comprehensive income after tax [Member]
Accumulated other comprehensive income/(loss)
Balances, beginning of period	14	(29)
Balances, end of period		14
Accumulated other comprehensive income/(loss) net of tax
Balances, beginning of period	$ 14	(29)
Balances, end of period		$ 14

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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