Retirement Savings Plans - Narrative (Details) (USD $)	1 Months Ended	12 Months Ended
	Jan. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer matching contribution, percent of match	50.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay	6.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 377,000	$ 0	$ 0
Foreign Pension Plan, Defined Benefit [Member] | France [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Provision for employee retirement obligations			$ 255,000	$ 230,000