Description of Business and Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets	$ 1,876,000	$ 1,338,000
Cash designated as collateral on performance bonds	$ 520,000
Percentage of cash value of the bonds as collateral	100.00%
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