Summary of Significant Accounting Policies (Tables) - USD ($)
$ in Thousands

12 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Mar. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Stock-based compensation expense

Share-Based Compensation. The following table shows total share-based compensation expense included in the consolidated statements of net income and comprehensive income for the for the fiscal year ended March 31,2017, 2016, and 2015:

	Fiscal Year Ended March 31,
	2017			2016			2015
Costs and expenses:
Cost of revenue	$	514		$	404		$	373
Research and development costs, net	973			318			396
Selling, general and administrative	6,111			2,573			2,703
Total share-based compensation	7,598			3,295			3,472
Income tax benefit	(2,637		)	(1,018		)	(1,054		)
Decrease in net income	$	4,961		$	2,277		$	2,418

Cash, Uninsured Amount

$ 36,572

Cash, FDIC Insured Amount

250

Advertising Expense

$ 7,111

$ 7,890

$ 7,079