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Fair Value Measurement, Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value by Investment Category (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Adjusted Cost | $ 3,135 | $ 7,611
Adjusted Cost | 3,450 | 4,366
Unrealized Gains | 3 | 0
Unrealized Losses | 0 | 0
Fair Value | 3,453 | 4,366
Adjusted Cost | 5,526 | 9,414
Fair Value | $ 5,529 | 9,414
Minimum [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Maturities of available for sale securities | 1 year |
Maximum [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Maturities of available for sale securities | 2 years |
Cash [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Adjusted Cost | $ 2,076 | 5,048
Fair Value | 2,076 | 5,048
Cash and Cash Equivalents | 2,076 | 5,048
Mutual Funds [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Adjusted Cost | 613 | 1,107
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 613 | 1,107
US Agency Securities [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Adjusted Cost | 2,837 | 3,259
Unrealized Gains | 3 | 0
Unrealized Losses | 0 | 0
Fair Value | 2,840 | 3,259
Recurring [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Fair Value | 3,135 | 7,611
Cash and Cash Equivalents | 3,135 | 7,611
Investments Available for Sale | 2,394 | 1,803
Recurring [Member] | Cash [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Fair Value | 2,076 | 5,048
Cash and Cash Equivalents | 2,076 | 5,048
Recurring [Member] | Level 1 [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Fair Value | 1,059 | 2,563
Cash and Cash Equivalents | 1,059 | 2,563
Investments Available for Sale | 2,394 | 1,803
Recurring [Member] | Level 1 [Member] | Mutual Funds [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Fair Value | 613 | 1,107
Cash and Cash Equivalents | 613 | 1,107
Investments Available for Sale | 0 | 0
Recurring [Member] | Level 1 [Member] | US Agency Securities [Member] |  |
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract] |  |
Fair Value | 446 | 1,456
Cash and Cash Equivalents | 446 | 1,456
Investments Available for Sale | $ 2,394 | $ 1,803

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