Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 4)

Stockholders' Equity (Details 4) (USD $)	1 Months Ended	12 Months Ended
Stockholders' Equity (Details 4) (USD $)	Aug. 31, 2010	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2000
Shares
Nonvested, balance at the beginning of the period (in shares)		1,500,000	1,100,000
Nonvested, balance at the end of the period (in shares)		2,100,000	1,500,000	1,100,000
Additional disclosure
Stock-based compensation expense		$ 2,147,000	$ 1,601,000	$ 1,652,000
Number of preferred stock purchase right for each share of common stock		1
Preferred stock, par value (in dollars per share)		$ 0.001	$ 0.001
Purchase price (in dollars per share)		$ 10.00
Period following public announcement of beneficial ownership acquired by various persons resulting in rights becoming exercisable		10 days
Beneficial ownership of common stock (as a percent)		20.00%
Period following commencement of tender offer or exchange offer that would result in acquisition of beneficial ownership various persons resulting in rights becoming exercisable		10 days
Series A Junior Participating Preferred Stock
Additional disclosure
Preferred stock conversion basis		0.01
Purchase Plan
Additional disclosure
Number of shares of common stock reserved for issuance	1,400,000				900,000
Increase in common stock available under the plan	500,000
Expiration term from approval of grant	10 years
Maximum amount that can be contributed by the employee		25,000
Maximum percentage of regular compensation that can be contributed by the employee		15.00%
Percentage of the fair market value of common stock on the last day of the purchase right period		95.00%
Options granted (in shares)		12,302	22,478	21,338
Number of shares available for future grant		430,188
Restricted stock units
Shares
Nonvested, balance at the beginning of the period (in shares)		1,467,096
Granted (in shares)		1,379,818
Vested and issued (in shares)		(685,069)
Forfeited (in shares)		(100,621)
Nonvested, balance at the end of the period (in shares)		2,061,224	1,467,096
Awards expected to vest (in shares)		1,892,868
Weighted Average Grant-Date Fair Value
Nonvested restricted stock units outstanding at the beginning of the period (in dollars per share)		$ 1.10
Granted (in dollars per share)		$ 1.09
Vested and issued (in dollars per share)		$ 1.06
Forfeited (in dollars per share)		$ 1.11
Nonvested restricted stock units outstanding at the end of the period (in dollars per share)		$ 1.11	$ 1.10
Awards expected to vest (in dollars per share)		$ 1.11
Additional disclosure
Vesting period		4 years
Total fair value of units vested and issued		800,000	600,000	1,100,000
Stock-based compensation expense		1,000,000	800,000	700,000
Unrecognized compensation cost		$ 1,500,000
Weighted average period for recognizing compensation cost		2 years 4 months 24 days
Weighted average grant date fair value of options granted during the period (in dollars per share)		$ 1.09	$ 1.00	$ 1.47
Restricted stock units \| Minimum
Additional disclosure
Vesting period		2 years
Restricted stock units \| Maximum
Additional disclosure
Vesting period		4 years
Restricted stock units \| Awards vesting over two years with one-half of units vesting one year after the issuance date
Additional disclosure
Vesting period		1 year
Awards vesting percentage		50.00%
Restricted stock units \| Awards vesting over two years with other half of units vesting two years after the issuance date
Additional disclosure
Vesting period		2 years
Restricted stock units \| Awards vesting over four years with one-fourth units vesting one year after the issuance date
Additional disclosure
Vesting period		1 year
Awards vesting percentage		25.00%
Non-employee director
Weighted Average Grant-Date Fair Value
Granted (in dollars per share)		$ 1.26	$ 0.98	$ 1.20
Additional disclosure
Number of shares issued		91,603	103,574	77,971