COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Prepaid legal fees	$ 1,849	$ 213
Prepaid income tax	248	460
Prepaid maintenance agreements	1,978	856
Interest receivable	798	1,195
Advance to suppliers	1,601	1,211
Other	4,529	3,823
Total	$ 11,003	$ 7,758