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Deferred compensation arrangement with individual, unrecorded amount.

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No definition available.

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General description of deferred compensation arrangements. Deferred compensation represents currently earned compensation that, under the terms of a profit-sharing, rabbi trust, pension, employee contract, or equity-based (including stock or unit option) plan, is not actually paid until a later date and is therefore not taxable until that date. May also include some split-dollar life insurance arrangements. This type of arrangement is usually made to help employees postpone paying taxes on the income and also to retain employees longer.

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A general description of the nature of the existing leasing arrangements of a lessee for all operating leases including, but not limited to: (1) rental escalation clauses; (2) renewal or purchase options; (3) guarantees or indemnities, if any, (4) restrictions imposed by lease arrangements; (5) unusual provisions or conditions; (6) contingent rentals, if any; and (7) lease expiration dates.

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

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Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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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