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Investments and Fair Value Measurements (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Cash, cash equivalents and investments [Abstract] |  |  |  |
Cash | $ 39,189,000 |  | $ 43,610,000 |
Cash equivalents [Abstract] |  |  |  |
Certificates of deposit |  |  | 742,000 |
Total cash and cash equivalents | 39,189,000 | $ 56,512,000 | 44,352,000 | $ 36,152,000
Amortized cost | 27,916,000 |  | 32,701,000 |
Cash, cash equivalents and investments, amortized costs | 67,105,000 |  | 77,053,000 |
Gross Unrealized (Loss) | (210,000) |  | (93,000) |
Fair Value | 27,706,000 |  | 32,608,000 |
Cash, cash equivalents and investments, amortized costs | 66,895,000 |  | 76,960,000 |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Due within 1 year | 15,288,000 |  | 20,056,000 |
Due after 1 through 5 years | 12,628,000 |  | 12,645,000 |
Investments, amortized cost | 27,916,000 |  | 32,701,000 |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Due within 1 year | 15,195,000 |  | 20,032,000 |
Due after 1 through 5 years | 12,511,000 |  | 12,576,000 |
Investments, fair value | 27,706,000 |  | 32,608,000 |
Proceeds from sales of available-for-sale investments | 14,680,000 | 8,970,000 |  |
Investments held | 5,453,000 |  | 5,578,000 |
Equity Securities, FV-NI, Realized Gain (Loss) |  | 77,000 |  |
GHI |  |  |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Proceeds from sales of available-for-sale investments | 0 | 125,000 |  |
Available-for-sale investments, expenses |  | 48,000 |  |
Equity Securities, FV-NI, Realized Gain (Loss) |  | $ 77,000 |  |
Total Investments [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized cost | 27,916,000 |  | 32,701,000 |
Gross Unrealized (Loss) | (210,000) |  | (93,000) |
Fair Value | 27,706,000 |  | 32,608,000 |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 27,916,000 |  | 32,701,000 |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | 27,706,000 |  | 32,608,000 |
Certificates of Deposit [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized cost | 7,340,000 |  | 7,099,000 |
Gross Unrealized (Loss) | (41,000) |  | (24,000) |
Fair Value | 7,299,000 |  | 7,075,000 |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 7,340,000 |  | 7,099,000 |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | 7,299,000 |  | 7,075,000 |
Corporate Bonds [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized cost | 20,576,000 |  | 25,602,000 |
Gross Unrealized (Loss) | (169,000) |  | (69,000) |
Fair Value | 20,407,000 |  | 25,533,000 |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 20,576,000 |  | 25,602,000 |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | $ 20,407,000 |  | $ 25,533,000 |

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