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Investments and Fair Value Measurements (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Cash, cash equivalents and investments [Abstract] |  |  |  |
Cash | $ 55,818,000 |  | $ 23,948,000 |
Cash equivalents [Abstract] |  |  |  |
Certificates of deposit | 694,000 |  | 12,204,000 |
Total cash and cash equivalents | 56,512,000 | $ 25,067,000 | 36,152,000 | $ 24,875,000
Amortized Cost | 86,835,000 |  | 53,678,000 |
Gross Unrealized Gain | 1,000 |  | 112,000 |
Gross Unrealized (Loss) | (79,000) |  | (67,000) |
Fair Value | 86,757,000 |  | 53,723,000 |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Due within 1 year | 20,522,000 |  | 11,325,000 |
Due after 1 through 5 years | 9,801,000 |  | 6,201,000 |
Investments, amortized cost | 30,323,000 |  | 17,526,000 |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Due within 1 year | 20,483,000 |  | 11,415,000 |
Due after 1 through 5 years | 9,762,000 |  | 6,156,000 |
Investments, fair value | 30,245,000 |  | 17,571,000 |
Gross realized gains from sales of available-for-sale investments | 77,000 | 181,000 |  |
GHI |  |  |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Realized gain | 125,000 | 246,000 |  |
Available-for-sale investments, expenses | 48,000 | 65,000 |  |
Gross realized gains from sales of available-for-sale investments | 77,000 | $ 181,000 |  |
Auction Rate Securities [Member] |  |  |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | 0 |  |  |
Total Investments [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 30,323,000 |  | 17,526,000 |
Gross Unrealized Gain | 1,000 |  | 112,000 |
Gross Unrealized (Loss) | (79,000) |  | (67,000) |
Fair Value | 30,245,000 |  | 17,571,000 |
Certificates of Deposit [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 6,928,000 |  | 8,999,000 |
Gross Unrealized Gain | 1,000 |  | 1,000 |
Gross Unrealized (Loss) | (10,000) |  | (20,000) |
Fair Value | 6,919,000 |  | 8,980,000 |
Corporate Bonds [Member] |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 23,395,000 |  | 8,479,000 |
Gross Unrealized (Loss) | (69,000) |  | (47,000) |
Fair Value | $ 23,326,000 |  | 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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