Commitments and Contingencies - Government Grants (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) employee agreement	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Gain Contingencies [Line Items]
Government training reimbursement number of agreements | agreement	3
Government training reimbursement number of employees | employee	378
Proceeds from government grants, training reimbursement	$ 0	$ 194,000	$ 1,500,000
Gain (loss) on government grant reimbursement	744,000	99,000	0
Deferred government grant obligation, current	985,000	2,324,000
Other Operating Income (Expense)
Gain Contingencies [Line Items]
Gain (loss) on government grant reimbursement	744,000	99,000	$ 0
Training Reimbursement
Gain Contingencies [Line Items]
Deferred government grant obligation	2,700,000	3,500,000
Deferred government grant obligation, current	$ 985,000	$ 697,000