Marketable securities and fair value measurements.

No definition available.

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- Definition

This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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- Definition

Balance held at close of period in number of shares.

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- Definition

Number of shares of affiliates held for management investment companies.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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- Definition

Number of non-option equity instruments exercised by participants.

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-Name Accounting Standards Codification
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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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Marketable Securities and Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2015
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Carryover basis					$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised	284,091		0
Common stock warrants		$ 0	$ 360,795
Proceeds from warrant exercises	$ 902,000	902,000
Increase (decrease) in the fair value		$ (361,000)	$ (807,000)	$ (134,000)
Fair Value, Inputs, Level 1
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Investments in and Advances to Affiliates, Balance, Shares		1,644,155
Common stock \| Fair Value, Inputs, Level 1
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Number of shares owned (shares)		395,758