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Stockholders' Equity - Summary of Stock Option Activity (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Outstanding Beginning Balance, Number of Shares | 1,773,066 | 1,389,816
Granted, Number of Shares | 1,074,515 | 420,500
Canceled/Forfeited, Number of Shares | (402,128) | (37,250)
Outstanding Ending Balance, Number of Shares | 2,445,453 | 1,773,066
Outstanding Beginning Balance, Weighted-Average Exercise Price Per Share | $ 7.02 | $ 8.39
Granted, Weighted-Average Exercise Price Per Share | 1.93 | 2.38
Canceled/Forfeited, Weighted-Average Exercise Price Per Share | 15.64 | 5.98
Outstanding Ending Balance, Weighted-Average Exercise Price Per Share | 3.37 | 7.02
Exercise Price Per Share, Minimum | 1.17 | 1.17
Exercise Price Per Share, Maximum | 23.20 | 26.00
Outstanding, 1.17 — 26.00 [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Exercise Price Per Share, Minimum |  | 1.17
Exercise Price Per Share, Maximum |  | 26.00
Granted, 1.65 — 2.62 [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Exercise Price Per Share, Minimum |  | 1.65
Exercise Price Per Share, Maximum |  | 2.62
Canceled/Forfeited, 2.39 — 23.20 [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Exercise Price Per Share, Minimum |  | 2.39
Exercise Price Per Share, Maximum |  | 23.20
Outstanding, 1.17 — 26.00 [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Exercise Price Per Share, Minimum |  | 1.17
Exercise Price Per Share, Maximum |  | $ 26.00
Granted, 1.51 — 3.12 [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Exercise Price Per Share, Minimum | 1.51 |
Exercise Price Per Share, Maximum | 3.12 |
Canceled/Forfeited, 1.51 — 26.00 [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Exercise Price Per Share, Minimum | 1.51 |
Exercise Price Per Share, Maximum | 26.00 |
Outstanding, 1.17 — 23.20 [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Exercise Price Per Share, Minimum | 1.17 |
Exercise Price Per Share, Maximum | $ 23.20 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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