STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Jan. 31, 2018

STOCK-BASED COMPENSATION

Summary of stock based compensation expense

The following table summarizes the stock-based compensation expenses included in the statements of operations and comprehensive loss for the periods ended (in thousands):

	Year ended
	January 31,
	2018		2017
Research and development	$	545	$	398
Sales and marketing		393		346
General and administrative		949		747
Total	$	1,887	$	1,491

Black-Scholes option pricing model fair value assumptions

	Year ended
	January 31,
	2018	2017
Expected volatility	83.9% - 96.8%	95.5% - 98.6%
Expected term in years	6.0 - 9.39	5.0 - 6.5
Risk-free interest rate	1.80% - 2.70%	1.12% - 2.03%
Expected dividend yield	—	—