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Cash, Cash Equivalents and Investments (Tables) | 9 Months Ended
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Sep. 30, 2019
Cash, Cash Equivalents and Investments [Abstract] |
Summary of Cash, Cash Equivalents and Investments |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | As of September 30, 2019
﻿ |  |  | Gross |  | Gross |  |
﻿ | Amortized |  | unrealized |  | unrealized |  | Fair
﻿ | Cost |  | gains |  | losses |  | Value
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 18,505 |  | $ | — |  | $ | — |  | $ | 18,505
﻿Commercial paper |  | 14,579 |  |  | — |  |  | — |  |  | 14,579
﻿Total cash and cash equivalents |  | 33,084 |  |  | — |  |  | — |  |  | 33,084
﻿Investments: |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | 12,117 |  |  | 1 |  |  | — |  |  | 12,118
﻿Corporate debt securities |  | 3,992 |  |  | 10 |  |  | — |  |  | 4,002
﻿Total investments |  | 16,109 |  |  | 11 |  |  | — |  |  | 16,120
﻿Total cash, cash equivalents and investments | $ | 49,193 |  | $ | 11 |  | $ | — |  | $ | 49,204
﻿Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
﻿Certified deposits | $ | 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: |  |  |  |  |  |  |  |  |  |  |
﻿Certified deposits | $ | 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 | $ | 30,699
﻿Total investments | $ | 30,699
﻿

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