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Cash and Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Cash, cash equivalents and investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 49,094 | $ 102,390
Gross unrealized gains | 6 | 3
Gross unrealized losses | (1) | (39)
Fair value | 49,099 | 102,354
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 29,627 | 18,844
Fair value | 29,627 | 18,844
Cash and money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 18,644 | 18,844
Fair value | 18,644 | 18,844
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 10,983 |
Fair value | 10,983 |
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 19,467 | 83,546
Gross unrealized gains | 6 | 3
Gross unrealized losses | (1) | (39)
Fair value | 19,472 | 83,510
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 16,971 | 53,493
Gross unrealized gains | 1 |
Gross unrealized losses | (1) | (24)
Fair value | 16,971 | 53,469
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,496 | 10,223
Gross unrealized gains | 5 | 3
Gross unrealized losses |  | (12)
Fair value | 2,501 | 10,214
U.S. government and agency securities, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost |  | 19,830
Gross unrealized losses |  | (3)
Fair value |  | 19,827
Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,000 | 4,500
Fair value | $ 4,000 | $ 4,500

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