CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings	Total
Beginning Balance - Shares at Mar. 31, 2013	27,065,209
Beginning Balance - Amount at Mar. 31, 2013	$ 27	$ 54,004	$ 45	$ 78,107	$ 132,183
Issuance of common stock under employee stock option plans, Shares	932,800
Issuance of common stock under employee stock option plans, Amount	$ 1	3,080			3,081
Repurchase and retirement of common stock, shares	(436,527)
Repurchase and retirement of common stock, amount		(2,880)			(2,880)
Stock-based compensation expense		2,228			2,228
Windfall tax benefits recognized		(33)			(33)
Comprehensive loss:
Net loss				(6,189)	(6,189)
Net unrealized gain (loss) on available-for-sale investments			(12)		(12)
Total comprehensive loss					(6,201)
Ending Balance, Shares at Mar. 31, 2014	27,561,482
Ending Balance, Amount at Mar. 31, 2014	$ 28	56,399	33	71,918	128,378
Issuance of common stock under employee stock option plans, Shares	228,665
Issuance of common stock under employee stock option plans, Amount		952			952
Repurchase and retirement of common stock, shares	(4,661,775)
Repurchase and retirement of common stock, amount	$ (5)	(30,021)			(30,026)
Stock-based compensation expense		2,077			2,077
Comprehensive loss:
Net loss				(4,978)	(4,978)
Net unrealized gain (loss) on available-for-sale investments			(7)		(7)
Total comprehensive loss					(4,985)
Ending Balance, Shares at Mar. 31, 2015	23,128,372
Ending Balance, Amount at Mar. 31, 2015	$ 23	29,407	26	66,940	96,396
Issuance of common stock under employee stock option plans, Shares	199,961
Issuance of common stock under employee stock option plans, Amount		818			818
Repurchase and retirement of common stock, shares	(1,611,969)
Repurchase and retirement of common stock, amount	$ (1)	(7,025)			(7,026)
Stock-based compensation expense		1,850			1,850
Comprehensive loss:
Net loss				(2,170)	(2,170)
Net unrealized gain (loss) on available-for-sale investments			1		1
Total comprehensive loss					(2,169)
Ending Balance, Shares at Mar. 31, 2016	21,716,364
Ending Balance, Amount at Mar. 31, 2016	$ 22	$ 25,050	$ 27	$ 64,770	$ 89,869