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Commitments and Contingencies - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 02, 2018 | Apr. 02, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 13, 2019 | Jan. 16, 2019 | Dec. 31, 2014
Mr. Selbo |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |
Severance amount paid in cash |  | $ 150,000 |  |  |  |  |  |
Mr. Charles Myers |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |
Severance amount paid in cash | $ 507,200 |  |  |  |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |
Contingent Severance cost |  |  |  |  |  |  |  | $ 575,000
Severance cost, description |  |  | These agreements provided severance in the aggregate amount of $575,000 for termination without cause as defined in the agreements. |  |  |  |  |
Minimum | Subsequent Event | James K. Sims |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |
Contingent Severance cost |  |  |  |  |  | $ 200,000 |  |
Minimum | President, Chief Financial Officer and Secretary and Senior Vice President | Subsequent Event |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |
Contingent Severance cost |  |  |  |  |  |  | $ 455,000 |
Office Space and Research Facilities Lease |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |
Operating leases, rent expense |  |  | $ 911,887 | $ 805,271 | $ 742,829 |  |  |
Lease agreement description |  |  | The San Diego facility lease agreement included a tenant improvement allowance which provided for the landlord to pay for tenant improvements on behalf of the Company up to $515,000. Based on the terms of this landlord incentive and involvement of the Company in the construction process, the leasehold improvements purchased under the landlord incentive were determined to be property of the Company. |  |  |  |  |
Lease expiration date |  |  | Feb. 28, 2022 |  |  |  |  |
Office Space and Research Facilities Lease | Maximum |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments for tenant improvements allowance |  |  | $ 515,000 |  |  |  |  |

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