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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 208,432 | $ 49,094
Gross unrealized gains | 133 | 6
Gross unrealized losses | (15) | (1)
Fair value | 208,550 | 49,099
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 69,027 | 29,627
Gross unrealized gains | 1 |
Gross unrealized losses |  |
Fair value | 69,028 | 29,627
Cash and money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 41,784 | 18,644
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 41,784 | 18,644
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 24,243 | 10,983
Gross unrealized gains | 1 |
Gross unrealized losses |  |
Fair value | 24,244 | 10,983
U.S. government and agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 10,097 |
Gross unrealized gains | 1 |
Gross unrealized losses | (1) |
Fair value | 10,097 |
U.S. Treasury security [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 3,000 |
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 3,000 |
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 139,405 | 19,467
Gross unrealized gains | 132 | 6
Gross unrealized losses | (15) | (1)
Fair value | 139,522 | 19,472
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 105,377 | 16,971
Gross unrealized gains | 12 | 1
Gross unrealized losses | (9) | (1)
Fair value | 105,380 | 16,971
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 21,081 | 2,496
Gross unrealized gains | 119 | 5
Gross unrealized losses | (5) |
Fair value | 21,195 | 2,501
U.S. Treasury security, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,850 |
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 2,850 |
Long-term restricted cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 3,500 | 4,000
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | $ 3,500 | $ 4,000

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