Significant Accounting Policies - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 04, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 166,779		$ 72,187
Guaranteed investment certificate	14,525		39,974
Term deposit	10,070		0
Total Assets	191,374		112,161
Liabilities
Warrants	883		5,099	$ 5,379	$ 4,015
Contingent consideration	7,497	$ 6,727	0
Financial instrument	0		0
Total Liabilities	8,380		5,099
Fair Value, Inputs, Level 1
Assets
Cash and cash equivalents	166,779		72,187
Guaranteed investment certificate	14,525		39,974
Term deposit	10,070
Total Assets	191,374		112,161
Fair Value, Inputs, Level 3
Liabilities
Warrants	883		5,099
Contingent consideration	7,497
Financial instrument	0		0
Total Liabilities	$ 8,380		$ 5,099