STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Oct. 31, 2017

STOCK-BASED COMPENSATION

Summary of stock based compensation expense

The following table summarizes the stock-based compensation expenses included in the condensed consolidated statement of operations and comprehensive loss (in thousands):

	For the three months ended				For the nine months ended
	October 31,				October 31,
	2017		2016		2017		2016
Research and development	$	131	$	87	$	397	$	292
Sales and marketing		98		65		289		247
General and administrative		236		195		730		505
Total	$	465	$	347	$	1,416	$	1,044

Black-Scholes option pricing model fair value assumptions

	For the three months ended	For the nine months ended
	October 31,	October 31,
	2016	2017	2016
Expected volatility	96.8%	95.5% - 96.8%	96.8% - 98.6%
Expected term in years	5.0 - 6.0	6.0 - 9.6	5.0 - 6.5
Risk-free interest rate	1.12% - 1.32%	1.80% - 2.35%	1.12% - 1.32%
Expected dividend yield	—	—	—