Assets (Details 3) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts Receivable, Net
Allowance for doubtful accounts receivable (in dollars)	$ 400	$ 200
Inventories
Materials	47,362	42,373
Work in process	23,332	30,327
Finished goods	6,511	4,769
Inventories	77,205	77,469
Prepaid expenses and other current assets
Supplier deposits	$ 21,300	$ 14,600