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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2019
Summary of Significant Accounting Policies [Abstract] |
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis |
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﻿ | September 30, 2019 |  | December 31, 2018
﻿(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 18,505 |  | $ | — |  | $ | — |  | $ | 18,505 |  | $ | 18,844 |  | $ | — |  | $ | — |  | $ | 18,844
﻿Commercial paper |  | — |  |  | 14,579 |  |  | — |  |  | 14,579 |  |  | — |  |  | — |  |  | — |  |  | —
﻿Total cash and cash equivalents |  | 18,505 |  |  | 14,579 |  |  | — |  |  | 33,084 |  |  | 18,844 |  |  | — |  |  | — |  |  | 18,844
﻿Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | — |  |  | 12,118 |  |  | — |  |  | 12,118 |  |  | — |  |  | 53,469 |  |  | — |  |  | 53,469
﻿Corporate debt securities |  | — |  |  | 4,002 |  |  | — |  |  | 4,002 |  |  | — |  |  | 10,214 |  |  | — |  |  | 10,214
﻿US government & agency securities |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 19,827 |  |  | — |  |  | 19,827
﻿Total investments |  | — |  |  | 16,120 |  |  | — |  |  | 16,120 |  |  | — |  |  | 83,510 |  |  | — |  |  | 83,510
﻿Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Certified deposits |  | 4,000 |  |  | — |  |  | — |  |  | 4,000 |  |  | 4,500 |  |  | — |  |  | — |  |  | 4,500
﻿Total assets measured at fair value | $ | 22,505 |  | $ | 30,699 |  | $ | — |  | $ | 53,204 |  | $ | 23,344 |  | $ | 83,510 |  | $ | — |  | $ | 106,854
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﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Financing derivative | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 16 |  | $ | 16
﻿Total liabilities measured at fair value | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 16 |  | $ | 16
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Estimated Fair Value and Carrying Value of Notes |
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﻿ | September 30, 2019 |  | December 31, 2018
﻿ | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
﻿Notes payable | $ | 16,069 |  | $ | 15,546 |  | $ | 15,915 |  | $ | 14,659
﻿
Anti-dilutive Shares Excluded from Computation of Diluted Net Loss per Share |
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﻿ |  | Nine Months Ended September 30, |  |
﻿(in thousands) |  | 2019 |  | 2018 |  |  |  |
﻿Options to purchase common stock |  | 23,048 |  | 27,397 |  |  |  |
﻿RSUs with time-based vesting |  | 1,094 |  | 349 |  |  |  |
﻿RSUs with performance-based vesting |  | 138 |  | 634 |  |  |  |
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