GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION - Property and Equipment by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 9,216	$ 7,387
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	4,949	3,824
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	4,129	3,131
Others
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 138	$ 432