Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Accounts Receivable, Allowance for Credit Loss, Current	$ 25,000	$ 70,000
Collaboration Income	0	7,716,667
Accumulated deficit	(196,881,800)	(194,789,605)
Liabilities for product warranty costs	49,600	75,300
Marketing and Advertising Expense [Abstract]
Advertising and promotion expense	$ 210,548	$ 1,652,171
Segment Reporting [Abstract]
Revenues from sales outside the United States, percentage	15.00%	13.00%
Product Warranties Disclosures [Abstract]
Liabilities for product warranty costs	$ 49,600	$ 75,300
Accounts Receivable [Member] \| Two Customers [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	50.00%	42.00%
Revenue Benchmark [Member] \| Two Customers [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	35.00%
Revenue Benchmark [Member] \| One Customer [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		19.00%

Amount of income from collaborations.

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Percentage of revenues from sales outside the United States.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The total expense recognized in the period for promotion, public relations, and brand or product advertising.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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