Description of Business and Summary of Significant Accounting Policies (Details)	3 Months Ended	9 Months Ended
	Dec. 31, 2014	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) customer	Mar. 31, 2015 USD ($)
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets		$ 1,727,000		$ 1,338,000
Cash designated as collateral on performance bonds		$ 520,000
Percentage of cash value of the bonds as collateral		100.00%
Goodwill and Long-Lived Assets
Impairment of long-lived and intangible assets		$ 0	$ 0
Total Revenues | One individual customer
Concentration of Credit Risk
Percentage of total revenue	12.00%		11.00%
Total Revenues | Customer
Concentration of Credit Risk
Number of customers | customer			1
Maximum
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts
Expected period for unbilled amounts to be billed and collected		12 months
Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts
Expected period for unearned amounts to be earned		12 months
Warranty
Warranty period		3 years
Maximum | Property and equipment
Property and Equipment
Useful life		8 years
Minimum
Warranty
Warranty period		1 year
Minimum | Property and equipment
Property and Equipment
Useful life		3 years