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Marketable Securities and Fair Value Measurements (Short Term Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cost | $ 253 | $ 6,972
Unrealized Gain (Loss) | (3) | 3
Fair Value | 250 | 6,975
Corporate debt securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cost | 253 | 2,236
Unrealized Gain (Loss) | (3) | 2
Fair Value | $ 250 | 2,238
U.S. government treasury bills |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cost |  | 2,249
Unrealized Gain (Loss) |  | 1
Fair Value |  | 2,250
Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cost |  | 2,487
Unrealized Gain (Loss) |  | 0
Fair Value |  | $ 2,487

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