Stock Based Compensation (Tables)

3 Months Ended

Jun. 30, 2018

Stock Based Compensation

Summary of activity in the plans with respect to stock options

	Number of Shares		Weighted Average Exercise Price Per Share
	(In thousands)
Options outstanding at March 31, 2018	4,124		$	3.58
Granted	45		5.06
Exercised	(18	)	2.30
Forfeited	—		—
Expired	—		—
Options outstanding at June 30, 2018	4,151		$	3.60

Summary of activity with respect to RSUs

	Number of Shares
	(In thousands)
RSUs outstanding at March 31, 2018	144
Granted	4
Vested	—
Forfeited	(4	)
RSUs outstanding at June 30, 2018	144

Schedule of stock-based compensation expense

	Three Months Ended
	June 30,
	2018		2017
	(In thousands)
Cost of revenues	$	35	$	15
Selling, general and administrative expense	427		392
Research and development expense	60		42
Total stock-based compensation expense	$	522	$	449