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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 |

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- Definition 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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