Fair Value Measurements (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Mar. 31, 2015
LIABILITIES
Fair value of contingent consideration		$ 8,313	$ 9,124
Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	92,648	118,993
Restricted cash and cash equivalents		4,452	2,419
Marketable securities	[2]	12,165	11,592
Total		109,265	133,004
LIABILITIES
Fair value of contingent consideration		8,046	16,155
Total		8,046	16,155
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	92,648	118,993
Restricted cash and cash equivalents		4,452	2,419
Marketable securities	[2]	12,165	11,592
Total		109,265	133,004
LIABILITIES
Fair value of contingent consideration		0	0
Total		0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Marketable securities	[2]	0	0
Total		0	0
LIABILITIES
Fair value of contingent consideration		0	0
Total		0	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Marketable securities	[2]	0	0
Total		0	0
LIABILITIES
Fair value of contingent consideration		8,046	16,155
Total		$ 8,046	$ 16,155

[1] Cash equivalents consist of money market funds.

[2] Marketable securities consist of available-for-sale money market instruments and fixed-income securities, including certificates of deposit, corporate bonds and notes, and municipal securities.