On July 29, 2015, the Company's registration statement on Form S-3, as filed with the SEC on July 23, 2015, was declared effective using a "shelf" registration process. Under this shelf registration statement, the Company may issue, in one or more offerings, any combination of common stock, preferred stock, senior or subordinated debt securities, warrants, or units, up to a total dollar amount of $100 million.

No definition available.

STOCKHOLDERS' EQUITY - Additional information (Details)						1 Months Ended					3 Months Ended		6 Months Ended		12 Months Ended
STOCKHOLDERS' EQUITY - Additional information (Details)	Apr. 20, 2020 USD ($)	Apr. 01, 2020 USD ($) $ / shares	Feb. 28, 2020 shares	Jul. 09, 2019 USD ($)	May 31, 2019 USD ($) $ / shares shares	Jul. 31, 2020 USD ($) $ / shares shares	Feb. 28, 2020 USD ($) shares	Jul. 22, 2019 USD ($) shares	Mar. 04, 2019 USD ($) shares	Feb. 28, 2018 USD ($) shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($) $ / shares shares	Jul. 26, 2018 USD ($)
Stockholders Equity [Line Items]
Number of preferred stock authorized \| shares											5,000,000		5,000,000		5,000,000
Number of common stock authorized \| shares					50,000,000						100,000,000	100,000,000	100,000,000	100,000,000	100,000,000
Number of shares issued \| shares													4,301,869
Aggregate registered amount for offerings																$ 150,000,000
Average selling price \| $ / shares											$ 6.53		$ 6.53
Net proceeds from issuance of stock													$ 27,238,000
Expenses incurred											$ 49,000		49,000
Proceeds from Issuance of Common Stock													$ 27,238,000
Number of option granted \| shares			1,041,325										1,553,825
Grant date fair value of these unvested options											6,279,000		$ 6,279,000
Stock or Unit Option Plan Expense											197,000		$ 197,000
Percentage of Milestone Activity Met by the Company													20.00%
Share-Based Compensation Arrangement By Share Based Payment Award, Number Of Vesting Tranches			4
Allocated Share-based Compensation Expense											$ 1,046,000	$ 145,000	$ 1,776,000	$ 372,000
Exercise price per share \| $ / shares											$ 9.90		$ 9.90
Expected life of the stock option													10 years
expected dividends													0.00%
Risk free interest rate, minimum													0.37%
Risk free rate maximum													0.96%
Total unrecognized compensation cost related to stock options											$ 3,764,000		$ 3,764,000
Amortized period													33 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares \| shares													553,635
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures													$ 328,939	425,639
Class of Warrant or Right, Outstanding \| shares											0		0
February 28, 2018 Performance-Based Award [Member] \| Restricted stock
Stockholders Equity [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross \| shares										146,200
Stock Issued During Period, Value, Restricted Stock Award, Gross										$ 1,148,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures											$ 0	0	$ 96,000	96,000
March 4, 2019 Performance-Based Award [Member] \| Restricted stock
Stockholders Equity [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross \| shares									22,220
Stock Issued During Period, Value, Restricted Stock Award, Gross									$ 179,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures											12,000	21,000	14,000	19,000
July 22, 2019 Performance-Based Award [Member] \| Restricted stock
Stockholders Equity [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross \| shares								180,300
Stock Issued During Period, Value, Restricted Stock Award, Gross								$ 1,300,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures											93,000	196,000	0	0
February 28 2020 Performance Based Award [Member] \| Restricted stock
Stockholders Equity [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross \| shares							168,100
Stock Issued During Period, Value, Restricted Stock Award, Gross							$ 1,014,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures											$ 84,000	$ 451,000	$ 0	$ 0
Cantor Fitzgerald and Co. [Member]
Stockholders Equity [Line Items]
Number of shares issued \| shares					2,094,140
Average selling price \| $ / shares					$ 8.72
Net proceeds from issuance of stock					$ 17,718,000
Proceeds from Issuance of Common Stock					$ 17,718,000
Jefferies LLC and B. Riley FBR, Inc [Member]
Stockholders Equity [Line Items]
Number of shares issued \| shares						242,367					3,868,258				191,244
aggregate offering price	$ 50,000,000			$ 25,000,000
Average selling price \| $ / shares		$ 10.27									$ 6.41		$ 6.41		$ 4.11
Net proceeds from issuance of stock		$ 2,414,000									$ 24,062,000				$ 762,000
Proceeds from Issuance of Common Stock		$ 2,414,000									$ 24,062,000				$ 762,000
Commission rate (as a percent)				3.00%
Series A Preferred Stock [Member]
Stockholders Equity [Line Items]
Number of preferred stock authorized \| shares												5,000,000		5,000,000
Exercise Price Ranging From 5.68 To 6.57 [Member] \| Maximum
Stockholders Equity [Line Items]
Exercise price per share \| $ / shares											$ 10.58		$ 10.58
Expected volatility													69.80%
Exercise Price Ranging From 5.68 To 6.57 [Member] \| Minimum
Stockholders Equity [Line Items]
Exercise price per share \| $ / shares											$ 5.68		$ 5.68
Expected volatility													66.30%
Subsequent event \| Jefferies LLC and B. Riley FBR, Inc [Member]
Stockholders Equity [Line Items]
Number of shares issued \| shares						242,367
Average selling price \| $ / shares						$ 10.27
Net proceeds from issuance of stock						$ 2,414,000
Proceeds from Issuance of Common Stock						$ 2,414,000