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Cash and Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Cash, cash equivalents and investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 102,390 | $ 62,904
Gross unrealized gains | 3 |
Gross unrealized losses | (39) | (32)
Fair value | 102,354 | 62,872
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 18,844 | 16,507
Fair value | 18,844 | 16,507
Cash and money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 18,844 | 14,858
Fair value | 18,844 | 14,858
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost |  | 1,649
Fair value |  | 1,649
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 83,546 | 46,397
Gross unrealized gains | 3 |
Gross unrealized losses | (39) | (32)
Fair value | 83,510 | 46,365
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 53,493 | 20,408
Gross unrealized losses | (24) | (14)
Fair value | 53,469 | 20,394
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 10,223 | 9,043
Gross unrealized gains | 3 |
Gross unrealized losses | (12) | (9)
Fair value | 10,214 | 9,034
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 | 16,946
Gross unrealized losses | (3) | (9)
Fair value | 19,827 | 16,937
Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,500 | 4,500
Fair value | $ 4,500 | $ 4,500

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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