Assets Held for Sale and Discontinued Operations - Schedule of Assets Held for Sale (Detail) (Detector Tube Assets, USD $)		12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014 Scenario, Forecast
Long Lived Assets Held-for-sale [Line Items]
Gain on disposition of assets		$ 2,300,000
Inventory, net of reserve	1,800,000
Property, net of depreciation	200,000
Total assets	$ 2,000,000