Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($)	1 Months Ended						3 Months Ended	12 Months Ended
Stockholders' Equity (Details) - USD ($)	Aug. 31, 2021	Jan. 31, 2021	Oct. 31, 2020	Sep. 30, 2020	Jan. 31, 2020	Aug. 31, 2019	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Aug. 31, 2015
Equity Offering
Common Stock shares, Outstanding								9,914,158	7,139,068
Warrants to purchase shares of common stock									1,112,313
Finance costs attributable to issuance of warrants								$ 0	$ 211,000
Stock-based compensation								1,541,000	7,000
Net proceeds								5,000,000.0
Proceeds from Warrant Exercises								$ 0	$ 7,243,000
Issuance of common stock upon exercises of warrants, net (in shares)									450,761
2015 Plan
Equity Offering
Number of additional shares authorized		1,000,000
Number of shares agreed to issue										1,000,000
Common Stock
Equity Offering
Issuance of common stock, net (in shares)								2,775,000	3,605,000
Issuance of common stock upon exercises of warrants, net (in shares)									1,563,000
Common Stock \| Restricted stock agreement with Maxim Group, LLC
Equity Offering
Number of shares agreed to issue	50,000
Vesting period	12 months
Stock-based compensation								$ 36,000
Warrant
Equity Offering
Warrants to purchase shares of common stock									1,022,408
August 2019 Offering \| Common Stock
Equity Offering
Issuance of common stock, net (in shares)						49,334
August 2019 Offering \| Pre-Funded Warrants [Member] \| Common Stock
Equity Offering
Warrants to purchase shares of common stock						45,744
Exercise price of warrants (in dollars per share)						$ 0.30
August 2019 Offering \| Placement Warrants \| Common Stock
Equity Offering
Warrants to purchase shares of common stock						95,078
Exercise price of warrants (in dollars per share)						$ 32.10
January 2020 Offering
Equity Offering
Issuance of common stock, net (in shares)					290,000
Warrants to purchase shares of common stock					290,000
Exercise price of warrants (in dollars per share)					$ 7.50
Proceeds from sale of common stock					$ 1,900,000
Finance costs attributable to issuance of warrants							$ 200,000
September 2020 Offering
Equity Offering
Issuance of common stock, net (in shares)				648,000
Share issue price (in dollars per share)				$ 4.20			$ 4.20
Proceeds from sale of common stock				$ 2,400,000
January 2021 Offering
Equity Offering
Issuance of common stock, net (in shares)		2,725,000
Warrants to purchase shares of common stock		2,725,000
Exercise price of warrants (in dollars per share)		$ 3.55
Proceeds from sale of common stock		$ 8,800,000
October 2020 Offering
Equity Offering
Exercise price of warrants (in dollars per share)			$ 3.00
Share issue price (in dollars per share)			$ 3.00
Proceeds from sale of common stock			$ 8,000,000.0
Number of units issued			2,666,667
Number Of Shares That Each Unit Entitles			1
Number of warrant that each unit entitles			1
Number of shares that each warrant entitles			1
Underwriting discounts and commissions			$ 1,600,000
Net proceeds			$ 5,700,000