Stock-Based Compensation - Expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Stock-Based Compensation
Stock-based compensation expense	$ 233,000	$ 89,000	$ 429,000	$ 274,000
Stock options
Stock-Based Compensation
Unrecognized compensation expense related to unvested stock options	2,300,000		$ 2,300,000
Weighted average period over which compensation expense is expected to be recognized			3 years 3 months 18 days
Restricted stock units
Stock-Based Compensation
Unrecognized compensation expense related to unvested RSUs	295,000		$ 295,000
Weighted average period over which compensation expense is expected to be recognized			2 years 9 months 18 days
Cost of revenues
Stock-Based Compensation
Stock-based compensation expense	13,000	5,000	$ 31,000	14,000
Selling, general and administrative expense.
Stock-Based Compensation
Stock-based compensation expense	205,000	64,000	363,000	219,000
Research and development expense.
Stock-Based Compensation
Stock-based compensation expense	$ 15,000	$ 20,000	$ 35,000	$ 41,000