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Summary of Series B Convertible Preferred Stock and Accretion of Dividend (Detail) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Stockholders Equity [Line Items] |  |
Cumulative dividends on Series B convertible preferred stock | $ 270 | $ 258
Series B convertible preferred stock |  |
Stockholders Equity [Line Items] |  |
Balance as of December 31, 2019 | 21,875 |
Cumulative dividends on Series B convertible preferred stock | 270 |
Balance as of March 31, 2020 | $ 22,145 |
Balance as of December 31, 2019, Shares | 5,469 |
Cumulative dividends on Series B convertible preferred stock | 67 |
Balance as of March 31, 2020, Shares | 5,536 |
Series B convertible preferred stock | Tranche One |  |
Stockholders Equity [Line Items] |  |
Balance as of December 31, 2019 | $ 13,230 |
Cumulative dividends on Series B convertible preferred stock | 165 |
Balance as of March 31, 2020 | $ 13,395 |
Balance as of December 31, 2019, Shares | 3,308 |
Cumulative dividends on Series B convertible preferred stock | 41 |
Balance as of March 31, 2020, Shares | 3,349 |
Series B convertible preferred stock | Tranche two |  |
Stockholders Equity [Line Items] |  |
Balance as of December 31, 2019 | $ 8,645 |
Cumulative dividends on Series B convertible preferred stock | 105 |
Balance as of March 31, 2020 | $ 8,750 |
Balance as of December 31, 2019, Shares | 2,161 |
Cumulative dividends on Series B convertible preferred stock | 26 |
Balance as of March 31, 2020, Shares | 2,187 |

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- Definition Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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