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Cash, Cash Equivalents and Investments (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash, cash equivalents and investments [Abstract] |  |  |  |
Cash | $ 43,610,000 | $ 23,948,000 |  |
Cash equivalents [Abstract] |  |  |  |
Certificates of deposit | 742,000 | 12,204,000 |  |
Total cash and cash equivalents | 44,352,000 | 36,152,000 | $ 24,875,000 | $ 28,814,000
Amortized Cost | 77,053,000 | 53,678,000 |  |
Gross Unrealized Gain |  | 112,000 |  |
Gross Unrealized (Loss) | (93,000) | (67,000) |  |
Fair Value | 76,960,000 | 53,723,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Due within 1 year | 20,056,000 | 11,325,000 |  |
Due after 1 through 5 years | 12,645,000 | 6,201,000 |  |
Investments, amortized cost | 32,701,000 | 17,526,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Due within 1 year | 20,032,000 | 11,415,000 |  |
Due after 1 through 5 years | 12,576,000 | 6,156,000 |  |
Investments, fair value | 32,608,000 | 17,571,000 |  |
Investments held | 5,578,000 | 6,599,000 |  |
Gross realized gains from sales of available-for-sale investments | 77,000 | 429,000 | 859,000 |
GHI |  |  |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Proceeds from sales of available-for-sale investments | 125,000 |  |  |
Investments held | 0 |  |  |
Realized gain |  | 581,000 |  |
Available-for-sale investments, expenses | 48,000 | 152,000 |  |
Gross realized gains from sales of available-for-sale investments | 77,000 | 429,000 |  |
Unrealized gain, net of tax |  | 111,000 | 432,000 |
Intelliepi |  |  |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Proceeds from sales of available-for-sale investments |  |  | 902,000 |
Investments held | 0 |  |  |
Available-for-sale investments, expenses |  |  | 43,000 |
Gross realized gains from sales of available-for-sale investments |  |  | $ 859,000 |
Total Investments [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 32,701,000 | 17,526,000 |  |
Gross Unrealized Gain |  | 112,000 |  |
Gross Unrealized (Loss) | (93,000) | (67,000) |  |
Fair Value | 32,608,000 | 17,571,000 |  |
Certificates of Deposit [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 7,099,000 | 8,999,000 |  |
Gross Unrealized Gain |  | 1,000 |  |
Gross Unrealized (Loss) | (24,000) | (20,000) |  |
Fair Value | 7,075,000 | 8,980,000 |  |
Corporate Bonds [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 25,602,000 | 8,479,000 |  |
Gross Unrealized (Loss) | (69,000) | (47,000) |  |
Fair Value | $ 25,533,000 | 8,432,000 |  |
Corporate Equity Securities [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost |  | 48,000 |  |
Gross Unrealized Gain |  | 111,000 |  |
Fair Value |  | $ 159,000 |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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