Income Taxes - Summary of Significant Components of Company's Net Deferred Income Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Net deferred tax assets:
Tax loss carry-forwards	$ 6,335	$ 42,863
Share based compensation	7,231	3,249
U.S. tax credit carry-forwards	3,823	631
Other assets	1,488	1,633
Other liabilities	(696)	(693)
Valuation allowance	(18,181)	(47,683)
Total net deferred income taxes	$ 0	$ 0