8. Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2017

Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]

Employee stock-based compensation expense

	Three Months				Nine Months
	Ended				Ended
	December 31,				December 31,
	2017		2016		2017		2016
Cost of service revenue	$	43,000	$	63,000	$	136,000	$	197,000
Research and development		38,000		77,000		128,000		201,000
Selling, general and administrative		584,000		774,000		1,266,000		1,334,000
Total stock-based compensation	$	665,000	$	914,000	$	1,530,000	$	1,732,000

Schedule of option activity

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Contractual Term		Aggregate Intrinsic Value
Outstanding at April 1, 2017		899,000		$	17.87
Options granted		536,000			6.83
Options exercised		(1,000	)		5.27
Options forfeited		(42,000	)		6.77
Options expired		(7,000	)		228.22
Outstanding at December 31, 2017		1,385,000		$	12.76		7.68	$	128,000
Exercisable at December 31, 2017		757,000		$	17.92		6.50	$	90,000

Restricted Stock Award Activity

	Number of Shares			Weighted Average Award Date Fair Value per Share
Unvested restricted stock awards outstanding at April 1, 2017		34,000		$	7.27
Restricted stock awards granted		98,000			5.49
Restricted stock awards vested		(99,000	)		5.78
Unvested restricted stock awards outstanding at December 31, 2017		33,000		$	6.46