SUBSEQUENT EVENTS (Details) - $ / shares	1 Months Ended		12 Months Ended
	Feb. 29, 2020	Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Stock options granted (in shares)			3,986,000	3,546,000	1,303,000
Granted exercise price (in dollars per share)			$ 1.02	$ 1.71	$ 1.64
Subsequent Event | 2014 Stock Incentive Plan
Subsequent Event [Line Items]
Stock options granted (in shares)		100,000
Granted exercise price (in dollars per share)		$ 0.84
Stock options grant-date fair value (in dollars per share)		$ 0.59
Vesting on the First Anniversary of Date of Grant | Subsequent Event | 2014 Stock Incentive Plan
Subsequent Event [Line Items]
Vesting rights rate		25.00%
Vesting at End of Each Successive Three-Month Period Thereafter | Subsequent Event | 2014 Stock Incentive Plan
Subsequent Event [Line Items]
Vesting rights rate		6.25%
Stock options | 2014 Stock Incentive Plan
Subsequent Event [Line Items]
Award vesting period			4 years
Award expiration period			10 years
Stock options | Vesting on the First Anniversary of Date of Grant | 2014 Stock Incentive Plan
Subsequent Event [Line Items]
Vesting rights rate			25.00%
Stock options | Vesting at End of Each Successive Three-Month Period Thereafter | 2014 Stock Incentive Plan
Subsequent Event [Line Items]
Vesting rights rate			6.25%
Share-based Payment Arrangement, Nonemployee | Stock options | Subsequent Event | 2014 Stock Incentive Plan
Subsequent Event [Line Items]
Stock options granted (in shares)	3,100,000
Granted exercise price (in dollars per share)	$ 0.89
Stock options grant-date fair value (in dollars per share)	$ 0.62
Vesting rights rate	6.25%
Award vesting period	3 months
Award expiration period	4 years