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Common Stock - Summary of Stock Options Outstanding Regarding Number of Common Shares Issuable upon Exercise of Vested Options (Detail) | 12 Months Ended
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Dec. 31, 2019 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Vested Options | shares | 325,379
Exercise Price Range, Weighted Average Vested Price | $ 22.93
Exercise Price Range, Weighted Average Remaining Contractual Term | 8 years 5 months 4 days
Range one [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Vested Options | shares | 34,826
Exercise Price Range, Weighted Average Vested Price | $ 1.42
Exercise Price Range, Weighted Average Remaining Contractual Term | 9 years 29 days
Exercise Price Range, Lower Range Limit | $ 1.42
Exercise Price Range, Upper Range Limit | $ 1.99
Range two [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Vested Options | shares | 162,076
Exercise Price Range, Weighted Average Vested Price | $ 2.56
Exercise Price Range, Weighted Average Remaining Contractual Term | 8 years 8 months 19 days
Exercise Price Range, Lower Range Limit | $ 2.00
Exercise Price Range, Upper Range Limit | $ 2.97
Range three [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Vested Options | shares | 59,410
Exercise Price Range, Weighted Average Vested Price | $ 3.37
Exercise Price Range, Weighted Average Remaining Contractual Term | 8 years 6 months 25 days
Exercise Price Range, Lower Range Limit | $ 2.98
Exercise Price Range, Upper Range Limit | 3.37
Range four [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | 3.38
Exercise Price Range, Upper Range Limit | 3.70
Range five [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | 3.71
Exercise Price Range, Upper Range Limit | $ 16.46
Range six [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Vested Options | shares | 63,144
Exercise Price Range, Weighted Average Vested Price | $ 28.90
Exercise Price Range, Weighted Average Remaining Contractual Term | 7 years 6 months 29 days
Exercise Price Range, Lower Range Limit | $ 16.47
Exercise Price Range, Upper Range Limit | $ 69.45
Range seven [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Vested Options | shares | 2,190
Exercise Price Range, Weighted Average Vested Price | $ 186.98
Exercise Price Range, Weighted Average Remaining Contractual Term | 5 years 6 months 25 days
Exercise Price Range, Lower Range Limit | $ 69.46
Exercise Price Range, Upper Range Limit | $ 206.25
Range eight [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Vested Options | shares | 853
Exercise Price Range, Weighted Average Vested Price | $ 465.93
Exercise Price Range, Weighted Average Remaining Contractual Term | 4 years 5 months 19 days
Exercise Price Range, Lower Range Limit | $ 206.26
Exercise Price Range, Upper Range Limit | $ 1,286.45
Range nine [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Vested Options | shares | 1,530
Exercise Price Range, Weighted Average Vested Price | $ 1,304.27
Exercise Price Range, Weighted Average Remaining Contractual Term | 3 years 9 months 10 days
Exercise Price Range, Lower Range Limit | $ 1,286.46
Exercise Price Range, Upper Range Limit | $ 1,348.05
Range ten [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Vested Options | shares | 1,350
Exercise Price Range, Weighted Average Vested Price | $ 1,605.51
Exercise Price Range, Weighted Average Remaining Contractual Term | 1 year 7 months 13 days
Exercise Price Range, Lower Range Limit | $ 1,348.06
Exercise Price Range, Upper Range Limit | $ 1,960.20

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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 The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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