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Cash and Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 142,561 | $ 49,094
Gross unrealized gains | 105 | 6
Gross unrealized losses | (75) | (1)
Fair value | 142,591 | 49,099
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 68,857 | 29,627
Gross unrealized gains | 6 |
Gross unrealized losses | (1) |
Fair value | 68,862 | 29,627
Cash and money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 32,529 | 18,644
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 32,529 | 18,644
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 36,328 | 10,983
Gross unrealized gains | 6 |
Gross unrealized losses | (1) |
Fair value | 36,333 | 10,983
U.S. government & agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 15,009 |
Gross unrealized gains | 86 |
Gross unrealized losses |  |
Fair value | 15,095 |
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 73,704 | 19,467
Gross unrealized gains | 99 | 6
Gross unrealized losses | (74) | (1)
Fair value | 73,729 | 19,472
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 45,697 | 16,971
Gross unrealized gains | 13 | 1
Gross unrealized losses |  | (1)
Fair value | 45,710 | 16,971
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 12,998 | 2,496
Gross unrealized gains |  | 5
Gross unrealized losses | (74) |
Fair value | 12,924 | 2,501
Long-term restricted cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,000 | 4,000
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | $ 4,000 | $ 4,000

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