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Cash And Cash Equivalents And Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash And Cash Equivalents And Investments [Abstract] |
Summary Of Cash, Cash Equivalents And Investments |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2017
﻿ |  |  | Gross |  | Gross |  |
﻿ | Amortized |  | unrealized |  | unrealized |  | Fair
﻿ | Cost |  | gains |  | losses |  | Value
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 14,858 |  | $ | — |  | $ | — |  | $ | 14,858
﻿Commercial paper |  | 1,649 |  |  | — |  |  | — |  |  | 1,649
﻿Total cash and cash equivalents |  | 16,507 |  |  | — |  |  | — |  |  | 16,507
﻿Investments: |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | 20,408 |  |  | — |  |  | (14) |  |  | 20,394
﻿Corporate debt securities |  | 9,043 |  |  | — |  |  | (9) |  |  | 9,034
﻿Asset backed securities |  | — |  |  | — |  |  | — |  |  | —
﻿US government & agency securities |  | 16,946 |  |  | — |  |  | (9) |  |  | 16,937
﻿Total investments |  | 46,397 |  |  | — |  |  | (32) |  |  | 46,365
﻿Total cash, cash equivalents and investments | $ | 62,904 |  | $ | — |  | $ | (32) |  | $ | 62,872
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
﻿Cash | $ | 4,500 |  | $ | — |  | $ | — |  | $ | 4,500
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2016
﻿ |  |  | Gross |  | Gross |  |
﻿ | Amortized |  | unrealized |  | unrealized |  | Fair
﻿ | Cost |  | gains |  | losses |  | Value
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 14,516 |  | $ | — |  | $ | — |  | $ | 14,516
﻿Commercial paper |  | 2,249 |  |  | — |  |  | — |  |  | 2,249
﻿Total cash and cash equivalents |  | 16,765 |  |  | — |  |  | — |  |  | 16,765
﻿Investments: |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | 23,581 |  |  | 5 |  |  | (3) |  |  | 23,583
﻿Corporate debt securities |  | 10,741 |  |  | 1 |  |  | (3) |  |  | 10,739
﻿Asset backed securities |  | 312 |  |  | — |  |  | — |  |  | 312
﻿US government & agency securities |  | 20,574 |  |  | 7 |  |  | (2) |  |  | 20,579
﻿Total investments |  | 55,208 |  |  | 13 |  |  | (8) |  |  | 55,213
﻿Total cash, cash equivalents and investments | $ | 71,973 |  | $ | 13 |  | $ | (8) |  | $ | 71,978
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
﻿Cash | $ | 4,500 |  | $ | — |  | $ | — |  | $ | 4,500
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿
Summary Of Contractual Maturities Of Cash Equivalents And Available-For-Sale Investments |
﻿ |  |
﻿ |  |
﻿(in thousands) | Fair Value
﻿Due in one year or less | $ | 48,014
﻿

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