Income Taxes - Summary of Significant Components of Company's Net Deferred Income Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Net deferred tax assets:
Net operating loss carry-forwards	$ 39,188	$ 6,335
Share based compensation	11,845	7,231
U.S. tax credit carry-forwards	4,566	3,823
Other assets	1,998	1,488
Other liabilities	(860)	(696)
Valuation allowance	(56,737)	(18,181)
Total net deferred income taxes	$ 0	$ 0