Income Taxes - Schedule of Change in Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Valuation allowance, at beginning of year	$ 84,167	$ 64,449	$ 47,858
Valuation allowance, at beginning of year, as adjusted	102,126	64,449	47,858
Increase in valuation allowance	13,563	19,718	16,591
Valuation allowance, at end of year	115,689	84,167	64,449
Valuation Allowance of Deferred Tax Assets
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Increase in valuation allowance- share-based compensation guidance impact	$ 17,959	$ 0	$ 0