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Future volatility period based on historical volatility.

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Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Per share or per unit amount of equity securities issued.

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Stockholders' Equity - Additional Information (Detail)									1 Months Ended		3 Months Ended		9 Months Ended	12 Months Ended
Stockholders' Equity - Additional Information (Detail)	Mar. 16, 2020 USD ($) shares	Oct. 10, 2019 USD ($) $ / shares shares	May 23, 2019 USD ($) $ / shares shares	Mar. 21, 2019 shares	Jul. 31, 2018 USD ($) $ / shares shares	Jul. 30, 2018 USD ($) $ / shares shares	Apr. 04, 2018 shares	Mar. 09, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Feb. 29, 2008 shares	Dec. 31, 2019 USD ($) $ / shares Plan shares	Dec. 31, 2018 USD ($) $ / shares shares	Sep. 29, 2018 shares	Dec. 31, 2019 USD ($) $ / shares Plan shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity award option plans \| Plan											2			2
Number of shares issued								158,100
Warrants outstanding								39,100
Gross proceeds from common stock \| $			$ 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						$ 3,801,000	$ 9,680,000
Exercise price of warrants \| $ / shares						$ 3.50		$ 11.40
Common stock, shares, issued									3,270,609		17,731,893	3,270,609		17,731,893	3,270,609
Common Shares, currently exercisable								39,100
Preferred stock, shares authorized									2,000,000		2,000,000	2,000,000		2,000,000	2,000,000
Preferred stock, par value \| $ / shares									$ 0.001		$ 0.001	$ 0.001		$ 0.001	$ 0.001
Preferred stock, shares outstanding									330,787		328,925	330,787		328,925	330,787
Issuance of series E preferred, shares									330,787		328,925	330,787		328,925	330,787
Preferred stock, stated value \| $
Historical volatility														4 years
Expected dividend yield															0.00%
Aggregate stock option cancellation rate, years														4 years
Cashless exercise of pre-funded warrants							39,100
Common stock available for future grants											78,452			78,452
Options outstanding, not yet exercised									137,256			137,256			137,256
Warrants Exercise \| $														$ 99,000		$ 200,000
Percentage of early exercise factor																30.00%
Fair value assumptions, expected life											8 months			8 months
Adjustments to fair value of warrant derivatives \| $															$ 52,000	$ 99,000
Estimated fair value of warrants \| $																28,000
Warrants Accounted for as Derivative Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in fair value of warrants \| $																28,000
Adjustments to fair value of warrant derivatives \| $																$ 99,000
Measurement Input, Risk Free Interest Rate [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, input value																1.5
Measurement Input, Price Volatility [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, input value																69
Measurement Input, Expected Dividend Rate [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, input value																0
Employee [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														2 years
Contractual term (years)														10 years
Board Members [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														2 years
Contractual term (years)														10 years
Series E Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock									2,273.0015
Preferred stock convertible into shares of common stock, price per share \| $ / shares					$ 3.50	$ 3.50
Issuance of series E preferred, shares					4,135.0015
Preferred stock, stated value \| $					$ 1,000	$ 1,000
Conversion of preferred stock to common stock				1,862					1,862			1,862			1,862
Preferred Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued						4,135.0015
Convertible Preferred Stock [Member] \| Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock													1,573.0015
Convertible Preferred Stock [Member] \| Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock													2,562
Convertible Preferred Stock [Member] \| Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock												700
Convertible Preferred Stock [Member] \| Tranche Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock												1,862
Convertible Preferred Stock [Member] \| Tranche Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock				1,862
Series A One Convertible Preferred Stock [Member] \| Baoli [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares issued										611,523
Convertible Preferred Stock To Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares outstanding									328,925			328,925			328,925
Series A Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock															1,827
Preference on liquidation \| $ / shares									$ 1			$ 1			$ 1
Preferred Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of series E preferred, shares						4,435.0015
Preferred stock, stated value \| $						$ 1,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock option cancellation rate														10.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock option cancellation rate														20.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Exercised														0	0
Stock Options [Member] \| Tranche One [Member] \| Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting, rate														50.00%
Stock Options [Member] \| Tranche Two [Member] \| Board Members [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting, rate														50.00%
Stock Options [Member] \| Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to nonvested awards not yet recognized \| $											$ 80,000			$ 80,000
Weighted-average contractual term of options outstanding														8 years 4 months 24 days
Weighted-average contractual term of stock options currently exercisable														5 years 7 months 6 days
Outstanding options expiration date														Oct. 31, 2028
Number of Shares, Exercised														0	0	0
Options outstanding, not yet exercised									140,323		137,256	140,323		137,256	140,323	12,613	13,116
Restricted Stock [Member] \| Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to nonvested awards not yet recognized \| $											$ 3,000			$ 3,000
(12) Warrants Related to July 2018 financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding											154,286			154,286
Exercise price of warrants \| $ / shares											$ 4.38			$ 4.38
Common Shares, currently exercisable											154,286			154,286
(13) Warrants Related to July 2018 financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding						154,286					119,000			119,000
Exercise price of warrants \| $ / shares						$ 4.375					$ 1.25			$ 1.25
Common Shares, currently exercisable						154,286					119,000			119,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued		11,834,000	1,700,000			2,571,429	38,720	119,000						9,634,000	1,509,000
Warrants outstanding		11,834,000						158,100
Gross proceeds from common stock \| $		$ 3,000,000
Issuance price per share \| $ / shares		$ 0.25	$ 1.00			$ 3.50
Warrants, exercisable period		5 years
Exercise price of warrants \| $ / shares						$ 20
Common stock, shares, issued						1,390,000		119,000
Common stock issued price per share \| $ / shares						$ 3.50		$ 12.65
Percentage of commons stock hold by certain investors								9.99%
Maximum exercise percentage of outstanding common stock						9.99%
Conversion of preferred stock to common stock						1,181,429
Common Shares, currently exercisable		11,834,000						158,100
Common Stock [Member] \| IPO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued						1,390,000
Common stock, shares, issued		11,834,000
Common Stock [Member] \| Baoli [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding										3,101,361
Maximum exercise percentage of outstanding common stock										9.90%
Common Shares, currently exercisable										3,101,361
Common Stock [Member] \| Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock													449,429
Common Stock [Member] \| Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock													732,000
Common Stock [Member] \| Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock												200,000
Common Stock [Member] \| Tranche Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock												532,000
Common Stock [Member] \| Tranche Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock				532,000
Common Stock [Member] \| Series E Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of preferred stock to common stock									649,429					532,000	649,429
Conversion of preferred stock to common stock				532,000					532,000			532,000			532,000
Common Stock [Member] \| Preferred Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued						1,181,429
Common Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of commons stock hold by certain investors						4.99%
Common Stock [Member] \| (12) Warrants Related to July 2018 financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued						2,571,429
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding		828,380
Issuance price per share \| $ / shares						$ 3.50
Exercise price of warrants \| $ / shares		$ 0.3125
Common Shares, currently exercisable		828,380
Number of Warrants Exercised											395,284
Warrants Exercise \| $											$ 99,000
Warrant [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Warrants Exercised	5,551,716
Warrants Exercise \| $	$ 1,400,000
Pre Funded Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding							39,100	39,100
Exercise price of warrants \| $ / shares								$ 12.55
Common Shares, currently exercisable							39,100	39,100
Warrant exercise price \| $ / shares								$ 0.10