Cash and Short-Term Investments - Summary by Type of Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cash, cash equivalents and available-for-sale investments measured at fair value on recurring basis		$ 83,845	$ 75,358
Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash, cash equivalents and available-for-sale investments measured at fair value on recurring basis		39,963	64,516
Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash, cash equivalents and available-for-sale investments measured at fair value on recurring basis		43,882	10,842
Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash, cash equivalents and available-for-sale investments measured at fair value on recurring basis		0	0
Cash
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents measured at fair value on a recurring basis	[1]	23,510	33,936
Cash | Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents measured at fair value on a recurring basis		23,510	33,936
Cash | Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents measured at fair value on a recurring basis		0	0
Cash | Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents measured at fair value on a recurring basis		0	0
Cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents measured at fair value on a recurring basis		1,555	2,559
Cash equivalents | Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents measured at fair value on a recurring basis		1,555	2,559
Cash equivalents | Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents measured at fair value on a recurring basis		0	0
Cash equivalents | Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents measured at fair value on a recurring basis		0	0
U.S. Treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		14,898	1,230
U.S. Treasury and agency securities | Level 1
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		14,898	1,230
U.S. Treasury and agency securities | Level 2
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
U.S. Treasury and agency securities | Level 3
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		28,263	10,794
Corporate bonds | Level 1
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Corporate bonds | Level 2
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		28,263	10,794
Corporate bonds | Level 3
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Asset-backed and mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		13,551	15
Asset-backed and mortgage-backed securities | Level 1
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Asset-backed and mortgage-backed securities | Level 2
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		13,551	15
Asset-backed and mortgage-backed securities | Level 3
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		2,068	0
Municipal bonds | Level 1
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Municipal bonds | Level 2
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		2,068	0
Municipal bonds | Level 3
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	26,791
Mutual funds | Level 1
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	26,791
Mutual funds | Level 2
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Mutual funds | Level 3
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Preferred Stock
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	33
Preferred Stock | Level 1
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	0
Preferred Stock | Level 2
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		0	33
Preferred Stock | Level 3
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		$ 0	$ 0

[1] Includes $1.2 million and $1.1 million restricted cash related to its voluntary disability insurance as of March 31, 2016 and 2015, respectively.