Income Taxes - Narritives(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits	$ 3,549	$ 3,680	$ 3,688
Unrecognized tax Benefits that would impact effective tax rate	3,200
Unrecognized tax benefits, penalties and interest expense	100
Uncertain tax benefits, potential change, current	400
Valuation allowance	88,566	86,752
Deferred tax assets, research	15,400
Investment tax credit	4,500
Deferred tax liabilities, undistributed foreign earnings	2,100
Undistributed earnings of foreign subsidiaries	6,400
Indefinite reinvestment of undistributed earnings from foreign subsidiaries	9,900
IRS
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	167,600	$ 61,500
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 4,100
Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	Dec. 31, 2036
CANADA
Operating Loss Carryforwards [Line Items]
Deferred tax assets, research	$ 16,000
Interest Expense [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, accrued tax penalties and interest	700
Penalty [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, accrued tax penalties and interest	$ 300