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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Marketable Securities [Abstract] |
Amortized Cost And Fair Value Of Marketable Securities |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿As of March 31, 2017 |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Corporate bonds |  | $ | 120,898 |  | $ | 76 |  | $ | (81) |  | $ | 120,893 |
﻿Certificates of deposit |  |  | 43,198 |  |  | - |  |  | - |  |  | 43,198 |
﻿Asset backed securities |  |  | 37,610 |  |  | 6 |  |  | (16) |  |  | 37,600 |
﻿Commercial paper |  |  | 17,013 |  |  | - |  |  | - |  |  | 17,013 |
﻿U.S. government bonds |  |  | 16,644 |  |  | 1 |  |  | (15) |  |  | 16,630 |
﻿Agency bonds |  |  | 4,600 |  |  | - |  |  | (1) |  |  | 4,599 |
﻿Total marketable securities |  | $ | 239,963 |  | $ | 83 |  | $ | (113) |  | $ | 239,933 |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿As of December 31, 2016 |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Corporate bonds |  | $ | 130,833 |  | $ | 40 |  | $ | (102) |  | $ | 130,771 |
﻿Certificates of deposit |  |  | 40,400 |  |  | - |  |  | - |  |  | 40,400 |
﻿Asset backed securities |  |  | 27,290 |  |  | 25 |  |  | - |  |  | 27,315 |
﻿Commercial paper |  |  | 20,228 |  |  | - |  |  | - |  |  | 20,228 |
﻿U.S. government bonds |  |  | 12,244 |  |  | 1 |  |  | (14) |  |  | 12,231 |
﻿Agency bonds |  |  | 4,600 |  |  | 4 |  |  | - |  |  | 4,604 |
﻿Municipal bonds |  |  | 1,400 |  |  | - |  |  | - |  |  | 1,400 |
﻿Total marketable securities |  | $ | 236,995 |  | $ | 70 |  | $ | (116) |  | $ | 236,949 |
﻿
Contractual Maturities Of Marketable Securities |
﻿ |  |  |  |  |  |  |
﻿As of March 31, 2017 |  |  | Amortized Cost |  |  | Fair Value |
﻿ |  |  |  |  |  |  |
﻿Due in one year or less |  | $ | 144,581 |  | $ | 144,547 |
﻿Due after one year through three years |  |  | 95,382 |  |  | 95,386 |
﻿ |  | $ | 239,963 |  | $ | 239,933 |
﻿

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