Balance Sheet Information (Details 2) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Restricted Cash
Restricted cash	$ 2,850,000	$ 2,850,000		$ 2,017,000
Accounts Receivable, Net
Allowance for doubtful accounts receivable (in dollars)	500,000	500,000		500,000
Inventories
Materials	35,377,000	35,377,000		36,523,000
Work in process	19,590,000	19,590,000		13,363,000
Finished goods	2,618,000	2,618,000		9,921,000
Inventories	57,585,000	57,585,000		59,807,000
Cost Method Investment
Additional cost method investment	800,000	1,594,000	10,341,000
Total recorded investment	16,100,000	16,100,000		14,500,000
Percentage ownership of preferred shares	15.30%	15.30%
Percentage ownership of cost method investee	12.00%	12.00%
Customer Deposits
Customer deposits	24,200,000	24,200,000		32,700,000
Collateral for Bank Guarantees
Restricted Cash
Restricted cash	$ 2,900,000	$ 2,900,000		$ 2,000,000