Business and Basis of Presentation (Detail) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Jun. 30, 2018
Organization And Basis Of Presentation [Line Items]
Restructuring Charges	$ 2,300,000		$ 2,300,000
Accounts receivable, net		$ 523,989			$ 523,989		$ 1,082,957
Net proceeds from issuance of stock and warrants					7,497	$ 9,254
Accumulated deficit		193,732,875			193,732,875		191,016,591
Cash and cash equivalents		3,186,636			3,186,636		6,780,429
Allowance for doubtful accounts		70,000			70,000		25,000
Prepaid expenses and other current assets		(672,487)			(672,487)		(860,915)
Assets, Current		(6,635,857)			(6,635,857)		(11,586,165)
Accrued Sales Return provisions		663,306			663,306		1,101,658
Liabilities, Current		(3,914,759)			(3,914,759)		(6,592,897)
Operating Lease, Liability, Noncurrent		(1,018,508)			(1,018,508)		(1,301,172)
Stockholders' Equity Attributable to Parent	$ 4,857,650	3,573,510	$ 4,857,650	$ 8,859,725	3,573,510	8,859,725	6,097,811	$ 7,721,608
Cost of revenues		914,322		1,821,111	6,382,340	6,726,675
Gross Profit		1,173,679		1,845,669	1,183,279	5,634,663
Net Income (Loss) Available to Common Stockholders, Diluted		(1,404,600)		$ 1,086,058	(2,716,284)	$ 2,826,238
Compensation cost not yet recognized		$ 25,629			$ 25,629
Compensation cost not yet recognized, period for recognition					1 year 9 months 8 days
Earnings Per Share, Basic		$ (0.14)		$ 0.15	$ (0.31)	$ 0.40
Earnings Per Share, Diluted		$ (0.14)		$ 0.08	$ (0.31)	$ 0.20
Operating Lease, Right-of-Use Asset		$ (1,541,975)			$ (1,541,975)		(1,968,062)
Other long-term assets		(29,650)			(29,650)		(30,314)
Assets		(8,506,777)			(8,506,777)		(13,991,880)
Accrued Liabilities, Current		(2,612,907)			(2,612,907)		(2,236,633)
Liabilities		(4,933,267)			(4,933,267)		$ (7,894,069)
Collaboration Income		$ 0		$ 3,750,000	$ 7,116,667	$ 12,255,704
One Customer [Member] | Revenue | Customer Concentration Risk
Organization And Basis Of Presentation [Line Items]
Concentration risk, percentage		19.00%		16.00%	20.00%
Two Customers | Revenue | Customer Concentration Risk
Organization And Basis Of Presentation [Line Items]
Concentration risk, percentage						28.00%
Two Customers | Accounts Receivable | Customer Concentration Risk
Organization And Basis Of Presentation [Line Items]
Concentration risk, percentage							45.00%
Three Customers [Member] | Accounts Receivable | Customer Concentration Risk
Organization And Basis Of Presentation [Line Items]
Concentration risk, percentage					53.00%
CalculatedUnderRevenueGuidanceInEffectBeforeTopic842 [Member]
Organization And Basis Of Presentation [Line Items]
Prepaid expenses and other current assets		$ (696,389)			$ (696,389)		$ (905,767)
Assets, Current		(6,659,759)			(6,659,759)		(11,631,017)
Liabilities, Current		(3,454,066)			(3,454,066)		(6,015,437)
Operating Lease, Liability, Noncurrent		0			0		0
Operating Lease, Right-of-Use Asset		0			0		0
Other long-term assets		(68,522)			(68,522)		(74,892)
Assets		(7,027,576)			(7,027,576)		(12,113,248)
Accrued Liabilities, Current		(2,152,214)			(2,152,214)		(1,659,173)
Liabilities		(3,454,066)			(3,454,066)		(6,015,437)
DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic842 [Member]
Organization And Basis Of Presentation [Line Items]
Prepaid expenses and other current assets		23,902			23,902		44,852
Assets, Current		23,902			23,902		44,852
Liabilities, Current		(460,693)			(460,693)		(577,460)
Operating Lease, Liability, Noncurrent		(1,018,508)			(1,018,508)		(1,301,172)
Operating Lease, Right-of-Use Asset		(1,541,975)			(1,541,975)		(1,968,062)
Other long-term assets		38,872			38,872		44,578
Assets		(1,479,201)			(1,479,201)		(1,878,632)
Accrued Liabilities, Current		(460,693)			(460,693)		(577,460)
Liabilities		$ (1,479,201)			$ (1,479,201)		$ (1,878,632)