Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Unrecognized tax benefits balance at beginning of year	$ 522	$ 1,033	$ 1,579
Reductions for tax positions of prior years		(465)	(471)
Reductions for currency translations	(85)	(46)	(75)
Unrecognized tax benefits balance at end of year	437	522	$ 1,033
Deferred tax assets resulting from the exercise of employee stock options, which will be allocated to paid-in capital	100	100
Pre-change net operating losses that can be used in future years	13,500
Deferred tax assets, U.S. net operating loss carryforwards	$ 71,600
Unrecognized loss recognition period	5 years
Unrecognized loss from change in ownership that should be recognized during the recognition period	$ 14,300
Gross deferred tax liability	(5,400)
Amount of research credit carryforwards subject to IRC Section 382 limitations	800
Un-repatriated foreign earnings	0
Accrued interest and penalties	400	400
Canada
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Research and experimental development expenditure carryforwards	16,000
Canadian ITC credit carryforwards	400
Unrecognized tax benefits | Canada
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Canadian ITC credit carryforwards	300
U.S.
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Gross deferred tax liability	5,447	8,011
Net operating loss carryforwards	27,202	18,857
Foreign
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Net operating loss carryforwards	5,797	$ 2,931
Foreign | Canada
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Unused net operating loss carryforwards	8,300
Foreign | Unrecognized tax benefits | Canada
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Net operating loss carryforwards	400
Federal and state
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Unused net operating loss carryforwards	786,000
Net operating loss carryforwards assumed during acquisition	117,000
Net operating loss carryforwards generated by the Company subsequent to acquisition	669,000
Net operating losses not subject to IRC section 382	$ 58,100