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COMMON STOCK - Common Stock Issued, Net of Issuance Costs (Details) - USD ($)								1 Months Ended		3 Months Ended			9 Months Ended
	Nov. 12, 2020	Oct. 02, 2020	May 21, 2020	Apr. 28, 2020	Aug. 06, 2019	Jun. 06, 2019	May 30, 2019	Oct. 31, 2020	May 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Common stock outstanding after the effect of reverse stock spilt conversion										10,433,851			10,433,851		3,339,380
Common stock, par value										$ 0.001			$ 0.001		$ 0.001
Proceeds from common stock													$ 13,530,000	$ 2,628,000
Subsequent Event
Proceeds from common stock								$ 50,200,000
Common Stock
Number of common stock issued										3,769,036		466,785	7,093,960	688,208
2020 Purchase Agreement | Lincoln Park
Maximum aggregate offering price			$ 12,000,000	$ 8,000,000
Period for financing from common stock			24 months
Number of common stock issued			156,250
Number of warrants issued for common stock			250,000
Warrant purchase price per share			$ 1.2989
2019 Purchase Agreement | Lincoln Park
Maximum aggregate offering price					$ 3,200,000	$ 10,000,000
Period for financing from common stock						24 months
Number of common stock issued									3,200,000		623,236
Proceeds from common stock									$ 7,700,000		$ 593,356
2019 Purchase Agreement | Lincoln Park | Subsequent Event
Number of common stock issued								1,100,000
Proceeds from common stock								$ 8,200,000
Securities Purchase Agreement | Lincoln Park
Number of common stock issued							104,294
Aggregate gross proceeds from common shares and warrants							$ 550,751
Warrant purchase price per share							$ 5.062
Securities Purchase Agreement | Lincoln Park | Maximum
Number of warrants issued for common stock							182,515
ATM Offering Agreement | Common Stock | Subsequent Event
Number of common stock issued	0
ATM Offering Agreement | Cantor Fitzgerald & Co
Number of common stock issued										2,100,000			4,100,000
Proceeds from common stock										$ 3,700,000			$ 13,900,000
ATM Offering Agreement | Cantor Fitzgerald & Co | Subsequent Event
Number of common stock issued								7,300,000
Proceeds from common stock								$ 42,000,000
ATM Offering Agreement | Cantor Fitzgerald & Co | Maximum
Sales commission percentage													2.50%
Registration rights agreement | Lincoln Park
Number of common stock issued			1,970,000							1,600,000			1,800,000
Proceeds from common stock										$ 3,500,000			$ 3,800,000
Registration rights agreement | Lincoln Park | Subsequent Event
Number of shares for resale		3,200,000
Number of common stock issued								1,100,000
Proceeds from common stock								$ 8,200,000

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