Significant Customer and Geographic Information - Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended											12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	[1]	Dec. 31, 2014	Sep. 30, 2014	[2]	Jun. 30, 2014	[3]	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region	$ 41,108	$ 40,623	$ 39,743	$ 37,813	$ 37,047		$ 36,747	$ 40,945		$ 50,272		$ 159,287	$ 165,011	$ 216,150
United States of America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region												77,488	70,977	101,275
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region												5,848	13,099	13,405
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region												22,344	21,808	21,477
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region												25,711	24,728	33,625
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region												18,715	22,974	23,125
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues by geographic region												$ 9,181	$ 11,425	$ 23,243

[1] The consolidated operating results for the fourth quarter of fiscal 2015 included a charge of $2.1 million related to the Veloce consideration, a charge of $4.1 million related to restructuring and an impairment charge of $0.5 million related to a strategic investment.

[2] The consolidated operating results for the second quarter of fiscal 2015 included an impairment charge of $2.5 million related to a strategic investment.

[3] The consolidated operating results for the first quarter of fiscal 2015 included a charge of $7.1 million related to the Veloce consideration and a charge of $1.2 million related to restructuring.