Significant Customer and Geographic Information - Revenue by Geographical Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 41,498	$ 37,813
United States of America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	18,239	18,044
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	2,649	1,314
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	9,343	5,971
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	5,891	7,392
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	3,846	3,813
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 1,530	$ 1,279