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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The cash inflow from the additional capital contribution to the entity.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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No definition available.

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Number of new stock issued during the period.

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The maximum financing from common stock.

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The minimum percentage considered for not to sale common stock under purchase agreement.

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No definition available.

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The percentage of common stock issuable under purchase agreement.

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The period for financing from common stock, in CCYY-MM-DD format.

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Sales commission percentage.

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The amount of remaining sales capacity under the stock purchase agreement.

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The threshold average sale price per share of common stock.

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COMMON STOCK - Common Stock Issued, Net of Issuance Costs (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Dec. 04, 2020	Apr. 14, 2017	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Common stock outstanding after the effect of reverse stock spilt conversion			33,536,315		33,536,315		19,171,859
Common stock, par value			$ 0.001		$ 0.001		$ 0.001
Net proceeds from common stock					$ 77,863	$ 6,291
Registered share available for future sales			0		0
ATM Offering Agreement
Number of common stock sold			0
Registered share available for future sales			0		0
Common Stock
Number of common stock issued			1,200,000	1,902,182	14,307,270	3,324,924
Cantor Fitzgerald & Co \| ATM Offering Agreement
Number of common stock issued					9,300,000
Net proceeds from common stock					$ 47,300
Cantor Fitzgerald & Co \| Maximum \| ATM Offering Agreement
Sales commission percentage		2.50%
December 2020 PA
Maximum aggregate offering price	$ 100,000
Period for financing from common stock	36 months
Threshold average sale price per share of common stock	$ 6.15
December 2020 PA \| Lincoln Park
Number of common stock issued			1,200,000		5,000,000.0
Net proceeds from common stock			$ 5,700		$ 30,600
Registered share available for future sales			10,800,000		10,800,000
2019 Purchase Agreement with Lincoln Park \| Maximum
Percentage of common stock issuable	19.99%
2019 Purchase Agreement with Lincoln Park \| Lincoln Park
Minimum percentage considered for not to sale common stock	9.99%