9. STOCK- BASED COMPENSATION (Tables)

12 Months Ended

Mar. 31, 2016

Stock-Based Compensation

Summary of stock option activities

			Weighted
		Number of Shares	Average	Weighted
	Shares	Underlying	Remaining	Average
	Available for	Options	Contractual	Exercise		Intrinsic
	Grant	Outstanding	Life (Years)	Price		Value
Balance at March 31, 2013	4,867,458	6,336,319			4.46
Options reserved	1,353,260	-			-
Granted	(784,303)	784,303			6.45
Exercised	-	(816,957)			3.10	$	2,629,982
Forfeited	149,085	(159,685)			6.04
Balance at March 31, 2014	5,585,500	6,143,980			5.13
Options reserved	1,377,699	-			-
Granted	(791,903)	791,903			5.20
Exercised	-	(119,085)			3.88		262,253
Forfeited	42,647	(42,647)			5.49
Balance at March 31, 2015	6,213,943	6,774,151			5.16
Options reserved	1,156,419	-			-
Granted	(969,913)	969,913			4.42
Exercised	-	(76,745)			4.19		46,977
Forfeited	31,614	(41,614)			4.82
Balance at March 31, 2016	6,432,063	7,625,705		$	5.08
Options vested and exercisable		5,246,088	3.70	$	5.02	$	939,846
Options vested and expected to vest		7,574,414	5.14	$	5.08	$	1,150,077

Schedule of options outstanding by exercise price

				Number of	Options Outstanding			Options Exercisable
				Shares	Weighted		Weighted Average		Weighted
				Underlying	Average		Remaining	Number	Average
				Options	Exercise		Contractual	Vested and	Exercise
Exercise Price				Outstanding	Price		Life (Years)	Exercisable	Price
$	2.43	-	3.40	895,204	$	3.17	5.06	586,394	$	3.05
$	3.43	-	4.00	1,118,969	$	3.81	3.10	1,118,969	$	3.81
$	4.17	-	4.81	935,478	$	4.41	5.75	670,261	$	4.33
$	4.90	-	4.98	793,963	$	4.95	7.92	298,150	$	4.91
$	5.13	-	5.34	625,513	$	5.23	8.49	62,626	$	5.22
$	5.50			783,433	$	5.50	0.63	783,433	$	5.50
$	5.59	-	6.00	899,930	$	5.77	5.24	568,526	$	5.80
$	6.28	-	6.63	808,219	$	6.48	6.08	645,440	$	6.47
$	6.82	-	7.00	651,376	$	6.90	5.76	398,669	$	6.92
$	9.20			113,620	$	9.20	4.83	113,620	$	9.20
				7,625,705	$	5.08	5.17	5,246,088	$	5.02

Summary of stock-based compensation expense by line item

	Year Ended March 31,
	2016		2015		2014
	(In thousands)
Cost of revenues	$	320	$	401	$	386
Research and development		858		941		970
Selling, general and administrative		672		735		872
Total	$	1,850	$	2,077	$	2,228

Schedule of weighted average assumptions

	Year Ended March 31,
	2016				2015				2014
	(In thousands)
Stock Option Plans:
Risk-free interest rate	1.41	-	1.57	%	1.47	-	1.7	%	0.91	-	1.61	%
Expected life (in years)			5.00				5.00				5.00
Volatility	36.3	-	38.0	%	40.4	-	44.8	%	45.5	-	48.4	%
Dividend yield			-	%			-	%			-	%
Employee Stock Purchase Plan:
Risk-free interest rate	0.09		0.15	%			0.05	%	0.07	-	0.09	%
Expected life (in years)			0.50				0.50				0.50
Volatility	26.3	-	27.9	%	30.8	-	38.0	%	30.4	-	32.8	%
Dividend yield			-	%			-	%			-	%