STOCK OPTIONS (Tables)

12 Months Ended

Dec. 31, 2016

STOCK OPTIONS.

Summary of option activity

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
		Exercise		Contractual	Intrinsic
Options	Shares	Price		Term in Years	Value
Outstanding at December 31, 2015	3,253,310	$	7.47
Granted	333,250	$	6.27
Forfeited	(257,570)	$	8.47
Exercised	(135,205)	$	1.41
Outstanding at December 31, 2016	3,193,785	$	7.52	6.93	$	571
Vested at December 31, 2016	1,811,996	$	7.54	6.32	$	563
Vested and expected to vest at December 31, 2016	2,741,045	$	7.52	6.81	$	568

Schedule of assumptions used principally in determining the fair value of options granted

	December 31,
	2016	2015	2014
Risk-free interest rate	1.20 - 1.52%	1.53 - 1.89%	1.62 - 2.06%
Expected dividend yield	0%	0%	0%
Expected term (employee grants)	5.99 years	6.00 years	6.03 years
Expected volatility	111%	116%	124%