Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Statement of Financial Position [Abstract]
Accounts receivable-trade, allowances	$ 25	$ 25
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	150,000,000	150,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares issued	40,611,411	40,066,005
Common stock, outstanding	33,338,522	36,351,716
Common stock held in treasury at cost, shares	7,272,889	3,714,289