Veloce (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	34 Months Ended	43 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Veloce Technologies, Inc. [Member]	Dec. 31, 2012 Veloce Technologies, Inc. [Member]	Mar. 31, 2012 Veloce Technologies, Inc. [Member]	Dec. 31, 2012 Veloce Technologies, Inc. [Member]	Jun. 20, 2012 Veloce Technologies, Inc. [Member]
Veloce (Textual) [Abstract]
Initial consideration according to merger agreement					$ 60,400,000	$ 60,400,000		$ 60,400,000	$ 60,400,000
Aggregate shares issued					0.2	2.9
Aggregate value of shares issued					1,100,000	16,000,000
Payment of aggregate consideration as cash					1,100,000	15,900,000
Initial consideration paid to date								31,900,000
Value of common stock to be issued (USD per share)									$ 5.546
Total initial consideration payable					28,500,000	28,500,000		28,500,000
Initial consideration payable to be paid in fixed shares					1.2	1.2		1.2
Initail consideration payable to be paid in cash					10,200,000	10,200,000		10,200,000
Total value of planned payments to initial consideration					16,900,000	16,900,000		16,900,000
Remaining initial consideration outstanding ater planned payments					11,600,000	11,600,000		11,600,000
Research and development expense recognized upon the probable achievement of the first performance milestone	82,711,000	28,279,000	151,865,000	86,256,000			60,400,000
Total consideration to be transferred					178,500,000	178,500,000		178,500,000	135,000,000
Research and development expenses incurred					51,900,000	56,600,000		117,000,000
Total research and development expenses expected to be incurred					$ 142,800,000	$ 142,800,000		$ 142,800,000