Income Taxes - Reconciliation of Provision for Income Taxes (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
U.S Statutory Income Taxes Rate	35.00%	35.00%	35.00%
Non-deductible expenses	(2.50%)	(2.40%)	(1.50%)
Foreign taxes rate differential	(14.20%)	(19.20%)	(26.50%)
Change in valuation allowance	(30.00%)	(18.20%)	(9.00%)
State income taxes	2.30%	1.80%	1.20%
Change in excess taxes benefit	1.20%
Unrecognized taxes expense (benefit)	(0.70%)	(1.20%)	0.30%
Other	0.40%	0.10%
Effective taxes rate	(8.50%)	(4.10%)	(0.50%)