Balance Sheet Information (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Restricted Cash
Restricted cash	$ 487,000	$ 2,738,000
Accounts Receivable, Net
Allowance for doubtful accounts receivable (in dollars)	900,000	2,400,000
Collection relating to previously reserved accounts	1,900,000
Inventories
Materials	26,305,000	34,301,000
Work in process	15,169,000	12,900,000
Finished goods	5,120,000	12,525,000
Inventories	46,594,000	59,726,000
Collateral for Bank Guarantees
Restricted Cash
Restricted cash	$ 500,000	$ 2,700,000