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Investments and Fair Value Measurements (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) item | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Cash, cash equivalents and investments [Abstract] |  |  |  |
Cash | $ 16,288,000 | $ 16,288,000 |  | $ 43,610,000
Cash equivalents [Abstract] |  |  |  |
Certificates of deposit | 1,747,000 | 1,747,000 |  | 742,000
Total cash and cash equivalents | 18,035,000 | 18,035,000 |  | 44,352,000
Amortized cost | 23,927,000 | 23,927,000 |  | 32,701,000
Cash, cash equivalents and investments, amortized costs | 41,962,000 | 41,962,000 |  | 77,053,000
Gross Unrealized (Loss) | (111,000) | (111,000) |  | (93,000)
Fair Value | 23,816,000 | 23,816,000 |  | 32,608,000
Cash, cash equivalents and investments, amortized costs |  | 41,851,000 |  | 76,960,000
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Due within 1 year | 22,007,000 | 22,007,000 |  | 20,056,000
Due after 1 through 5 years | 1,920,000 | 1,920,000 |  | 12,645,000
Investments, amortized cost | 23,927,000 | 23,927,000 |  | 32,701,000
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Due within 1 year | 21,910,000 | 21,910,000 |  | 20,032,000
Due after 1 through 5 years | 1,906,000 | 1,906,000 |  | 12,576,000
Investments, fair value | 23,816,000 | 23,816,000 |  | 32,608,000
Realized gain on sale of available-for-sale securities |  |  | $ (77,000) |
Transfers between fair value measurements | $ 0 | $ 0 |  |
GHI |  |  |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Proceeds from sales of investments |  |  | 125,000 |
Realized gain on sale of available-for-sale securities |  |  | (77,000) |
Cost of investment |  |  | $ 48,000 |
Number of transactions | item | 0 | 0 |  |
Total Investments [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized cost | $ 23,927,000 | $ 23,927,000 |  | 32,701,000
Gross Unrealized (Loss) | (111,000) | (111,000) |  | (93,000)
Fair Value | 23,816,000 | 23,816,000 |  | 32,608,000
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 23,927,000 | 23,927,000 |  | 32,701,000
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | 23,816,000 | 23,816,000 |  | 32,608,000
Certificates of Deposit [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized cost | 5,468,000 | 5,468,000 |  | 7,099,000
Gross Unrealized (Loss) | (31,000) | (31,000) |  | (24,000)
Fair Value | 5,437,000 | 5,437,000 |  | 7,075,000
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 5,468,000 | 5,468,000 |  | 7,099,000
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | 5,437,000 | 5,437,000 |  | 7,075,000
Corporate Bonds [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized cost | 18,459,000 | 18,459,000 |  | 25,602,000
Gross Unrealized (Loss) | (80,000) | (80,000) |  | (69,000)
Fair Value | 18,379,000 | 18,379,000 |  | 25,533,000
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 18,459,000 | 18,459,000 |  | 25,602,000
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | $ 18,379,000 | $ 18,379,000 |  | $ 25,533,000

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