CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Par value of common stock (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares outstanding (in shares)	50,337,705	50,037,206
Common stock, shares issued (in shares)	50,999,086	50,698,587
Treasury stock (in shares)	661,381	661,381
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1	1
Preferred stock, shares outstanding (in shares)	1	1
Accounts receivable, net of allowance for doubtful accounts of $2,031 and $1,242, respectively	$ 2,031	$ 1,242
Treasury Stock
Par value of common stock (in dollars per share)	$ 0.0001	$ 0.0001