Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 3	$ 69
Property and equipment, accumulated depreciation	11,282	6,716
Intangible assets, accumulated amortization	$ 29,012	$ 24,488
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	50,431,324	52,214,384
Common stock, shares outstanding	50,431,324	52,214,384
Treasury stock, shares	2,861,632	0