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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Net Loss Per Share [Abstract] |
Antidilutive Shares Excluded from Computation of Diluted Net Loss per Share |
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﻿ | Years Ended December 31,
﻿(in thousands) | 2018 |  | 2017 |  | 2016
﻿Options to purchase common stock | 25,176 |  | 25,404 |  | 22,501
﻿RSUs with time-based vesting | 371 |  | — |  | —
﻿RSUs with performance-based vesting | 586 |  | — |  | —
﻿

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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