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Common Stock - Stock Options - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for options currently outstanding | 1,010,935 |  | 1,010,935 |  | 665,585
Unrecognized compensation expense related to stock options granted | $ 2.1 |  | $ 2.1 |  | $ 1.8
Anti-dilutive securities excluded from earning per share computation | 5,137,655 | 3,854,505 | 5,137,655 | 3,854,505 |
Warrant [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Anti-dilutive securities excluded from earning per share computation | 4,116,712 |  | 4,116,712 |  |
Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Anti-dilutive securities excluded from earning per share computation | 1,010,935 |  | 1,010,935 |  |
Restricted Stock Unit [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Anti-dilutive securities excluded from earning per share computation | 10,008 |  | 10,008 |  |
Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted-average period, restricted stock awards |  |  | 2 years 3 months 18 days |  |
Stock Options [Member] | Employees and Consultants [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 4 years |  |
Stock Options [Member] | Minimum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award expiration period |  |  | 7 years |  |
Stock Options [Member] | Minimum [Member] | Board of Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 1 year |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award expiration period |  |  | 10 years |  |
Stock Options [Member] | Maximum [Member] | Board of Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
Restricted Stock Unit [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 4 years |  |
Common shares reserved for awards currently outstanding | 10,008 |  | 10,008 |  | 15,142
Weighted-average period, restricted stock awards |  |  | 1 year 10 months 2 days |  |
2018 Equity Incentive Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for issuance under incentive plan | 604,055 |  | 604,055 |  |
Award expiration period |  |  | 10 years |  |
2018 Equity Incentive Plan [Member] | Minimum [Member] | Employees and Consultants [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
2018 Equity Incentive Plan [Member] | Minimum [Member] | Board of Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 1 year |  |
2018 Equity Incentive Plan [Member] | Maximum [Member] | Employees and Consultants [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 4 years |  |
2018 Equity Incentive Plan [Member] | Maximum [Member] | Board of Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
2018 Equity Incentive Plan [Member] | Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for issuance under incentive plan | 1,336,055 |  | 1,336,055 |  |
Common shares reserved for options currently outstanding | 732,000 |  | 732,000 |  |
2017 Equity Incentive Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award expiration period |  |  | 10 years |  |
2017 Equity Incentive Plan [Member] | Minimum [Member] | Employees and Consultants [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
2017 Equity Incentive Plan [Member] | Minimum [Member] | Board of Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 1 year |  |
2017 Equity Incentive Plan [Member] | Maximum [Member] | Employees and Consultants [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 4 years |  |
2017 Equity Incentive Plan [Member] | Maximum [Member] | Board of Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
2017 Equity Incentive Plan [Member] | Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for issuance under incentive plan | 272,660 |  | 272,660 |  |
2010 Performance Incentive Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award expiration period |  |  | 10 years |  |
2010 Performance Incentive Plan [Member] | Minimum [Member] | Employees and Consultants [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
2010 Performance Incentive Plan [Member] | Minimum [Member] | Board of Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 1 year |  |
2010 Performance Incentive Plan [Member] | Maximum [Member] | Employees and Consultants [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 4 years |  |
2010 Performance Incentive Plan [Member] | Maximum [Member] | Board of Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
2010 Performance Incentive Plan [Member] | Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for issuance under incentive plan | 15,931 |  | 15,931 |  |
Common shares reserved for options currently outstanding | 5,923 |  | 5,923 |  |
2010 Performance Incentive Plan [Member] | Restricted Stock Unit [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for awards currently outstanding | 10,008 |  | 10,008 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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- 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 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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