COMMITMENTS AND CONTINGENCIES - Commitments (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($)	Oct. 31, 2018 USD ($) ft²	Oct. 31, 2017 USD ($)	Oct. 31, 2018 USD ($) ft²	Oct. 31, 2017 USD ($)	Sep. 30, 2017 ft²	Dec. 14, 2016 ft²
Operating lease commitments
2019		$ 79,000		$ 79,000
2020		280,000		280,000
2021		314,000		314,000
2022		324,000		324,000
2023		334,000		334,000
Total		1,331,000		1,331,000
Purchase commitments
2019		269,000		269,000
2020		269,000		269,000
2021		269,000		269,000
Total		807,000		807,000
Contractual obligation commitments
2019		348,000		348,000
2020		549,000		549,000
2021		583,000		583,000
2022		324,000		324,000
2023		334,000		334,000
Total		2,138,000		2,138,000
Rent expense
Rent expense		160,000	$ 154,000	480,000	$ 453,000
Capital lease obligation	$ 61,000
CRO agreements, remaining cost		$ 1,000,000		$ 1,000,000
Menlo Park, California
Rent expense
Leased office and laboratory area | ft²						12,203	12,066
San Jose, California
Rent expense
Leased office and laboratory area | ft²		11,793		11,793