Percentage of combined voting power of all classes of stock.

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Percentage of fair market value.

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Share based compensation arrangement by share based payment award options nonvested weighted average price per shares.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Number of shares issued under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of non-vested options outstanding.

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Stock-Based Compensation - Additional Information (Detail) - USD ($)		12 Months Ended
	Nov. 12, 2019	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)		164,980	49,410
Weighted average exercise price (in usd per share)		$ 7.16	$ 40.84
Weighted average grant-date fair value of options granted (in usd per share)		$ 4.58	$ 17.10
Aggregate instrinsic value of options issued or exercised			$ 0
Unrecognized stock-based compensation costs related to non-vested stock options		$ 545,459
Non-vested stock options (in shares)		164,980
Weighted average fair value of non-vested stock options (in usd per share)		$ 7.16
Weighted average period of recognition		1 year
Stock-based compensation expense		$ 190,331	$ 446,077
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		3 years	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		5 years	5 years
2004 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)	327,000
Expiration period		10 years
Shares authorized (in shares)		439,890
Shares issued in period (in shares)		24,500
Shares outstanding (in shares)		164,980
Weighted average exercise price (in usd per share)		$ 7.16
Shares available for future grant (in shares)		250,410
2004 Stock Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
2009 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)		1,250
2004 Stock Plan and 2009 Inducement Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of combined voting power of all classes of stock		10.00%
Percentage of fair value of common stock at date of grant		110.00%
2004 Stock Plan and 2009 Inducement Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years
2004 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights		The 2004 Stock Plan, among other things, provides for granting of incentive and nonqualified stock option and stock bonus awards to officers, employees and outside consultants. Outstanding options under the 2004 Stock Plan generally vest over four years and terminate 10 years after the grant date, or earlier if the option holder is no longer an executive officer, employee, consultant, advisor or director, as applicable, of the Company.
2010 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)		2,500
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum		1.00%
Shares issued in period (in shares)		4,331	2,280
Shares outstanding (in shares)		10,946
Percentage of fair value of common stock at date of grant		85.00%
Maximum percentage of earnings employee can authorize to withhold, percentage		10.00%
Award vesting rights		(i) 2,500 shares, (ii) 1 percent of the shares of common stock outstanding on the last day of the immediately preceding fiscal year, or (iii) such lesser number of shares as is determined by the Board. All of the Company’s full-time employees and certain part-time employees are eligible to participate in the 2010 ESPP. For part-time employees to be eligible, they must have customary employment of more than five months in any calendar year and more than 20 hours per week. Employees who, after exercising their rights to purchase shares under the 2010 ESPP, would own shares representing 5% or more of the voting power of the Company’s common stock, are ineligible to participate.
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		6 months
2004 and 2010 ESPPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from option exercises and purchases		$ 15,106	$ 18,618