Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Prepaid Expenses And Other Current Assets
Other receivable	$ 48	$ 179
Advances to suppliers	251	1,193
Prepaid insurance	1,051	329
Warranty deposits	334	921
Other	120	313
Total	$ 1,804	$ 2,935