Amount of income from collaborations.

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Amount of deferred collaboration income as of the balance sheet date.

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Long Term Assets and Total Liabilities

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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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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Concentration Risk [Line Items]
Number of Operating Segments	1
Allowance for doubtful accounts receivable, current	$ 70,000	$ 25,000
Collaboration Income	7,716,667	12,255,704
Accumulated deficit	(194,789,605)	(191,016,591)
Deferred Collaboration Income	0	1,956,522
Marketing and Advertising Expense [Abstract]
Advertising and promotion expense	$ 1,652,171	$ 5,766,982
Segment Reporting [Abstract]
Revenues from sales outside the United States, percentage	13.00%	12.00%
Product Warranties Disclosures [Abstract]
Liabilities for product warranty costs	$ 75,300	$ 129,837
Accounts Receivable [Member] \| Two Customers [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	42.00%	45.00%
Revenue Benchmark [Member] \| Two Customers [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		23.00%
Revenue Benchmark [Member] \| One Customer [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	19.00%
Accounting Standards Update 2016-02 [Member]
Concentration Risk [Line Items]
Long Term Assets and Total Liabilities			$ 1,900,000