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Marketable Securities and Fair Value Measurements - Schedule of Short Term Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cost | $ 737 | $ 6,972
Unrealized Gain (Loss) | (2) | 3
Fair Value | 735 | 6,975
Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cost |  | 2,487
Unrealized Gain (Loss) |  | 0
Fair Value |  | 2,487
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
Corporate debt securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cost | 737 | 2,236
Unrealized Gain (Loss) | (2) | 2
Fair Value | $ 735 | $ 2,238

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