Revenue Recognition - Financial Statement Impact of Adoption (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Apr. 01, 2018	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized Contract Cost, Amortization	$ 900		$ 1,800
Net revenue	34,203	$ 30,129	68,210	$ 63,994
Sales and marketing	4,393	4,207	9,146	9,337
Accounts receivable, net	18,963		18,963		$ 19,513	$ 16,389
Contract assets	4,696		4,696		4,583	0
Prepaid expenses and other current assets	5,089		5,089		5,097	5,593
Other non-current assets	4,699		4,699		4,893	2,484
Contract liabilities	25,789		25,789		33,826	26,820
Retained earnings	100,687		100,687		106,215	103,601
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(3,791)	(3,248)	(5,528)	(6,206)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	34,125		68,181
Sales and marketing	4,536		9,254
Accounts receivable, net	18,312		18,312			16,389
Contract assets	0		0			0
Prepaid expenses and other current assets	5,532		5,532			5,593
Other non-current assets	2,183		2,183			2,484
Contract liabilities	21,120		21,120			26,820
Retained earnings	97,936		97,936			$ 103,601
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(4,012)		(5,665)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	78		29
Sales and marketing	(143)		(108)
Accounts receivable, net	651		651		3,124
Contract assets	4,696		4,696		4,583
Prepaid expenses and other current assets	(443)		(443)		(496)
Other non-current assets	2,516		2,516		2,409
Contract liabilities	4,669		4,669		7,006
Retained earnings	2,751		2,751		$ 2,614
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	221		137
Products
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	8,769	7,318	17,849	17,601
Products | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	8,391		17,093
Products | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	378		756
Support, maintenance and subscription services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	18,856	17,108	36,785	33,775
Support, maintenance and subscription services | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	19,007		37,194
Support, maintenance and subscription services | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	(151)		(409)
Professional services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	6,578	$ 5,703	13,576	$ 12,618
Professional services | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	6,727		13,894
Professional services | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	$ (149)		$ (318)