Inventories (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Inventories
Inventory write-downs	$ 7,500,000
Inventory balances
Raw materials	28,545,000	5,139,000
Work in process	12,000	2,635,000
Finished goods	14,793,000	17,506,000
Deferred costs	5,153,000	73,000
Inventories, net	48,503,000	25,353,000
Total charge for inventories on hand in excess of demand, plus a purchase commitment fee	$ 10,225,000	$ 0