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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 82,866 | $ 102,390
Gross unrealized gains | 12 | 3
Gross unrealized losses | (6) | (39)
Fair value | 82,872 | 102,354
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 38,206 | 18,844
Gross unrealized gains |  |
Gross unrealized losses | (1) |
Fair value | 38,205 | 18,844
Cash and money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 29,329 | 18,844
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 29,329 | 18,844
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 8,877 |
Gross unrealized gains |  |
Gross unrealized losses | (1) |
Fair value | 8,876 |
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 44,660 | 83,546
Gross unrealized gains | 12 | 3
Gross unrealized losses | (5) | (39)
Fair value | 44,667 | 83,510
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 31,309 | 53,493
Gross unrealized gains | 1 |
Gross unrealized losses | (4) | (24)
Fair value | 31,306 | 53,469
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 6,970 | 10,223
Gross unrealized gains | 10 | 3
Gross unrealized losses | (1) | (12)
Fair value | 6,979 | 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 | 6,381 | 19,830
Gross unrealized gains | 1 |
Gross unrealized losses |  | (3)
Fair value | 6,382 | 19,827
Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,500 | 4,500
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | $ 4,500 | $ 4,500

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