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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 66,827 | $ 102,390
Gross unrealized gains | 21 | 3
Gross unrealized losses | (4) | (39)
Fair value | 66,844 | 102,354
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 30,360 | 18,844
Gross unrealized gains |  |
Gross unrealized losses | (2) |
Fair value | 30,358 | 18,844
Cash and money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 17,124 | 18,844
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 17,124 | 18,844
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 10,388 |
Gross unrealized gains |  |
Gross unrealized losses | (2) |
Fair value | 10,386 |
U.S. Treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,848 |
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 2,848 |
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 36,467 | 83,546
Gross unrealized gains | 21 | 3
Gross unrealized losses | (2) | (39)
Fair value | 36,486 | 83,510
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 29,590 | 53,493
Gross unrealized gains | 4 |
Gross unrealized losses | (2) | (24)
Fair value | 29,592 | 53,469
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 5,481 | 10,223
Gross unrealized gains | 16 | 3
Gross unrealized losses |  | (12)
Fair value | 5,497 | 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 | 1,396 | 19,830
Gross unrealized gains | 1 |
Gross unrealized losses |  | (3)
Fair value | 1,397 | 19,827
Certified deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,000 | 4,500
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | $ 4,000 | $ 4,500

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