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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number With Threshold Exercise Price Less Than Current Market Value.

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Price of a single share of a number of saleable stocks of a company.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Per share or per unit amount of equity securities issued.

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Stockholders' Equity - Additional Information (Detail)						3 Months Ended			9 Months Ended		15 Months Ended
Stockholders' Equity - Additional Information (Detail)	Jul. 06, 2020 USD ($) $ / shares shares	Oct. 10, 2019 USD ($) $ / shares shares	May 23, 2019 USD ($) $ / shares shares	Jul. 30, 2018 USD ($) $ / shares shares	Mar. 07, 2018 USD ($) $ / shares	Sep. 26, 2020 USD ($) $ / shares Plan shares	Dec. 31, 2019 USD ($) shares	Sep. 28, 2019 USD ($) $ / shares shares	Sep. 26, 2020 USD ($) $ / shares Plan shares	Sep. 28, 2019 USD ($) $ / shares shares	Sep. 28, 2020 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity award option plans \| Plan						2			2
Impact on net loss						$ 22,000		$ 23,000	$ 65,000	$ 70,000
Gross proceeds from common stock		$ 3,000,000	$ 1,700,000	$ 9,000,000	$ 2,000,000
Net proceeds from common stock		$ 2,400,000	$ 1,400,000	$ 7,980,000	$ 1,700,000					$ 1,421,000
Warrants Exercise									$ 2,479,000
Common stock issued \| shares	400,000
Preferred equity interest, value	$ 1,600,000
Purchase price \| $ / shares	$ 4.00
Securities Purchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued \| shares	400,000
Preferred equity interest, value	$ 1,600,000
Purchase price \| $ / shares	$ 4.00
Stock Options [Member] \| Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Exercised \| shares						0		0	0	0
Impact on net loss						$ 22,000			$ 63,000	$ 62,000	$ 20,000
Impact on basic and diluted net loss per share \| $ / shares						$ 0.01			$ 0.03	$ 0.14	$ 0.04
Total compensation cost related to nonvested awards not yet recognized						$ 17,000			$ 17,000
Weighted-average period									3 months
Weighted-average contractual term of options outstanding									7 years 8 months 12 days
Weighted-average contractual term of stock options currently exercisable									7 years 4 months 24 days
Exercisable options with an exercise price less than the current market value \| shares						0			0
Outstanding options expiration date									Oct. 31, 2028
Aggregate exercise price of options									$ 2,000,000
Minimum exercise price of options \| $ / shares									$ 19.20
Maximum exercise price of options \| $ / shares									$ 28,440
Restricted Stock [Member] \| Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Impact on net loss						$ 0		$ 3,000	$ 2,000	$ 8,000
Impact on basic and diluted net loss per share \| $ / shares						$ 0.00		$ 0.01	$ 0.00	$ 0.02
Total compensation cost related to nonvested awards not yet recognized						$ 0			$ 0
Stock compensation cost capitalized									$ 0
Restricted Stock [Member] \| Minimum [Member] \| Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of restricted stock under awards all have service conditions and vest over									1 year
Restricted Stock [Member] \| Maximum [Member] \| Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of restricted stock under awards all have service conditions and vest over									3 years
(11) Warrants Related to October 2019 financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding \| shares		1,183,400				217,200			217,200
Warrants, exercisable period		5 years
Exercise price of warrants \| $ / shares		$ 2.50				$ 2.50			$ 2.50
Common Shares, Expiration Date									Oct. 10, 2024
Number of Warrants Exercised \| shares						828	39,528		978,594
(12) Warrants Related to October 2019 financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding \| shares		82,838				30,916			30,916
Exercise price of warrants \| $ / shares		$ 3.125				$ 3.13			$ 3.13
Common Shares, Expiration Date		Oct. 08, 2024							Oct. 08, 2024
(9) Warrants related to July 2018 financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding \| shares				15,428		15,428			15,428
Warrants, exercisable period				5 years	5 years 7 months 6 days
Exercise price of warrants \| $ / shares				$ 43.75	$ 114.00	$ 43.75			$ 43.75
Common Shares, Expiration Date									Jul. 25, 2023
(10) Warrants related to May 2019 financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding \| shares			170,000			11,900			11,900
Exercise price of warrants \| $ / shares			$ 12.50			$ 12.50			$ 12.50
Common Shares, Expiration Date			May 23, 2024						May 23, 2024
(8) Warrants related to July 2018 financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding \| shares				257,142		257,143			257,143
Exercise price of warrants \| $ / shares				$ 35.00		$ 35.00			$ 35.00
Common Shares, Expiration Date				Jul. 25, 2023					Jul. 25, 2023
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued \| shares		1,183,400	11,900	257,142						170,000
Issuance price per share \| $ / shares		$ 2.50	$ 10.00	$ 35.00
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants Exercise						$ 2,000,000,000	$ 99,000		$ 2,500,000