Cash, Cash Equivalents and Investments (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash, cash equivalents and investments [Abstract]
Cash	$ 16,526,000	$ 43,610,000
Cash equivalents [Abstract]
Certificates of deposit		742,000
Total cash and cash equivalents	16,526,000	44,352,000
Amortized Cost	22,930,000	32,701,000
Cash, cash equivalents and investments, amortized costs	39,456,000	77,053,000
Gross Unrealized (Loss)	(84,000)	(93,000)
Fair Value	22,846,000	32,608,000
Cash, cash equivalents and investments, amortized costs	39,372,000	76,960,000
Contractual maturities on investments, amortized cost basis [Abstract]
Due within 1 year	22,210,000	20,056,000
Due after 1 through 5 years	720,000	12,645,000
Investments, amortized cost	22,930,000	32,701,000
Contractual maturities on investments, fair value basis [Abstract]
Due within 1 year	22,129,000	20,032,000
Due after 1 through 5 years	717,000	12,576,000
Investments, fair value	22,846,000	32,608,000
Investments, equity method	8,422,000	9,849,000
Realized gain on sale of available-for-sale securities		77,000	$ 429,000
GHI
Contractual maturities on investments, fair value basis [Abstract]
Investments, equity method	0	0
Proceeds from sales of investments		125,000
Cost of investment		48,000
Gross realized gain from sales of available-for-sale investments		77,000	429,000
Unrealized gain, net of tax		111,000
Available-for-sale investments, expenses			$ 152,000
Realized gain on sale of available-for-sale investment		581,000
Intelliepi
Contractual maturities on investments, fair value basis [Abstract]
Investments, equity method	0
Total Investments
Cash equivalents [Abstract]
Amortized Cost	22,930,000	32,701,000
Gross Unrealized (Loss)	(84,000)	(93,000)
Fair Value	22,846,000	32,608,000
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	22,930,000	32,701,000
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	22,846,000	32,608,000
Certificates of Deposit [Member]
Cash equivalents [Abstract]
Amortized Cost	4,508,000	7,099,000
Gross Unrealized (Loss)	(27,000)	(24,000)
Fair Value	4,481,000	7,075,000
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	4,508,000	7,099,000
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	4,481,000	7,075,000
Corporate Bonds [Member]
Cash equivalents [Abstract]
Amortized Cost	18,422,000	25,602,000
Gross Unrealized (Loss)	(57,000)	(69,000)
Fair Value	18,365,000	25,533,000
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	18,422,000	25,602,000
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	$ 18,365,000	$ 25,533,000

Refers to available for sale investments transaction expenses during the period.

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Fair value of investment in debt security and cash and cash equivalents measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security and cash and cash equivalents measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Amortized cost of investment in debt security measured at fair value with change recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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