Inventory (Schedule of inventory) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013
Inventory Disclosure [Abstract]
Write-down for inventory	$ 1,200,000
Components of Inventory
Raw materials	12,883,000	13,953,000
Work-in-process	342,000	1,904,000
Finished goods	34,704,000	50,019,000
Inventories	47,929,000	65,876,000
Less reserve for excess and obsolete inventory	(2,752,000)	(2,744,000)
Inventories, net	$ 45,177,000	$ 63,132,000