Fair Value Measurements (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Mar. 31, 2016
LIABILITIES
Fair value of contingent consideration		$ 18,367	$ 24,153
Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	23,994	27,176
Restricted cash and cash equivalents		4,647	5,320
Marketable securities	[2]		9,297
Total		28,641	41,793
LIABILITIES
Fair value of contingent consideration		18,367	23,843
Total		18,367	23,843
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	23,994	27,176
Restricted cash and cash equivalents		4,647	5,320
Marketable securities	[2]		9,297
Total		28,641	41,793
LIABILITIES
Fair value of contingent consideration		0	0
Total		0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Marketable securities	[2]		0
Total		0	0
LIABILITIES
Fair value of contingent consideration		18,367	0
Total		18,367	0
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Marketable securities	[2]		0
Total		0	0
LIABILITIES
Fair value of contingent consideration		0	23,843
Total		$ 0	$ 23,843

[1] Cash equivalents consist primarily 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.