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Outstanding Stock Options and Stock Awards Excluded from Calculation of Net Loss Per Share (Detail) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock Options and Stock Awards |  |  |
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |
Outstanding securities not included in diluted net loss per share calculation | 10,299 | 9,789 | 7,344
Warrant Liability |  |  |
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |
Outstanding securities not included in diluted net loss per share calculation |  | 5,841 |
Series B Convertible Preferred Stock |  |  |
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |
Outstanding securities not included in diluted net loss per share calculation | 4,140 | 4,840 |

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- Definition Antidilutive securities excluded from computation of earning per share. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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