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Cash and Cash Equivalents and Investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Cash and Cash Equivalents and Investments [Abstract] |
Summary of Cash, Cash Equivalents and Investments |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2019
﻿ |  |  | Gross |  | Gross |  |
﻿ | Amortized |  | unrealized |  | unrealized |  | Fair
﻿ | Cost |  | gains |  | losses |  | Value
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 18,644 |  | $ | — |  | $ | — |  | $ | 18,644
﻿Commercial paper |  | 10,983 |  |  | — |  |  | — |  |  | 10,983
﻿Total cash and cash equivalents |  | 29,627 |  |  | — |  |  | — |  |  | 29,627
﻿Investments: |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | 16,971 |  |  | 1 |  |  | (1) |  |  | 16,971
﻿Corporate debt securities |  | 2,496 |  |  | 5 |  |  | — |  |  | 2,501
﻿Total investments |  | 19,467 |  |  | 6 |  |  | (1) |  |  | 19,472
﻿Total cash, cash equivalents and investments | $ | 49,094 |  | $ | 6 |  | $ | (1) |  | $ | 49,099
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
﻿Cash | $ | 4,000 |  | $ | — |  | $ | — |  | $ | 4,000
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2018
﻿ |  |  | Gross |  | Gross |  |
﻿ | Amortized |  | unrealized |  | unrealized |  | Fair
﻿ | Cost |  | gains |  | losses |  | Value
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 18,844 |  | $ | — |  | $ | — |  | $ | 18,844
﻿Total cash and cash equivalents |  | 18,844 |  |  | — |  |  | — |  |  | 18,844
﻿Investments: |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | 53,493 |  |  | — |  |  | (24) |  |  | 53,469
﻿Corporate debt securities |  | 10,223 |  |  | 3 |  |  | (12) |  |  | 10,214
﻿US government & agency securities |  | 19,830 |  |  | — |  |  | (3) |  |  | 19,827
﻿Total investments |  | 83,546 |  |  | 3 |  |  | (39) |  |  | 83,510
﻿Total cash, cash equivalents and investments | $ | 102,390 |  | $ | 3 |  | $ | (39) |  | $ | 102,354
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿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 | $ | 30,455
﻿Due after one year through five years |  | —
﻿Total | $ | 30,455
﻿ |  |
﻿

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