Stockholders' Equity (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Sep. 30, 2012
Schedule of Option Activity Under Stock Incentive Plans
Number of Shares, Outstanding at the beginning of the year	4,164
Number of Shares, Granted	40
Number of Shares, Exercised	(14)
Number of Shares, Forfeited	(252)
Number of Shares, Outstanding at the end of the period	3,938
Vested and expected to vest at the end of the period	3,910
Number of Shares, Vested at the end of the period	3,133
Weighted Average Exercise Price Per Share, Outstanding at the beginning of the year	$ 10.67
Weighted Average Exercise Price Per Share, Granted	$ 5.58
Weighted Average Exercise Price Per Share, Exercised	$ 5.14
Weighted Average Exercise Price Per Share, Forfeited	$ 18.68
Weighted Average Exercise Price Per Share, Outstanding at the end of the period	$ 10.13
Weighted Average Exercise Price Per Share, Vested and expected to vest at the end of the period	$ 10.14
Weighted Average Exercise Price Per Share, Vested at the end of the period	$ 10.42