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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Options Issued and Outstanding |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Outstanding, beginning, Shares Available for Grant | 215,043 | 1,350,582 |
Shares reserved for issuance, Shares Available for Grant | 1,457,789 | 1,122,213 |
Options granted, Shares Available for Grant |  | (1,896,527) |
Options cancelled, Shares Available for Grant | 260,365 | 449,375 |
Outstanding, ending, Shares Available for Grant | 2,007,250 | 215,043 | 1,350,582
Outstanding, beginning, Number of Options | 2,562,800 | 1,122,677 |
Options granted, Number of Options |  | 1,896,527 |
Options exercised, Number of Options | 0 | (7,029) |
Options cancelled, Number of Options | (260,365) | (449,375) |
Outstanding, ending, Number of Options | 2,302,435 | 2,562,800 | 1,122,677
Exercisable, Number of Options | 577,853 | 461,150 |
Vested and expected to vest, Number of Options | 2,302,435 | 2,562,800 |
Outstanding, beginning, Weighted-Average Exercise Price per Option | $ 7.85 | $ 11.63 |
Options granted, Weighted-Average Exercise Price per Option |  | 6.28 |
Options exercised, Weighted-Average Exercise Price per Option |  | 0.79 |
Options cancelled, Weighted-Average Exercise Price per Option | 8.57 | 10.77 |
Outstanding, ending, Weighted-Average Exercise Price per Option | 7.76 | 7.85 | $ 11.63
Exercisable, Weighted-Average Exercise Price per Option | 10.75 | 11.40 |
Vested and expected to vest, Weighted-Average Exercise Price per Option | $ 7.76 | $ 7.85 |
Outstanding, Weighted-Average Remaining Contract Term | 8 years 6 months 18 days | 8 years 10 months 2 days | 9 years 2 months 19 days
Exercisable, Weighted-Average Remaining Contract Term | 7 years 1 month 2 days | 7 years 21 days |
Vested and expected to vest, Weighted-Average Remaining Contract Term | 8 years 6 months 18 days | 8 years 10 months 2 days |
Outstanding, ending, Aggregate Intrinsic Value | $ 21 | $ 200 |
Exercisable, Aggregate Intrinsic Value | 12 | 37 |
Vested and expected to vest, Aggregate Intrinsic Value | $ 21 | $ 200 |
Options Issued and Outstanding | Previously Reported |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Outstanding, beginning, Shares Available for Grant | 212,308 |  |
Outstanding, ending, Shares Available for Grant |  | 212,308 |
Restricted stock units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Other than options granted, Shares Available for Grant |  | (813,335) |
Other than options cancelled, Shares Available for Grant | 74,053 |  |

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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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