CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 11,707	$ 7,686	$ 6,865	$ 8,685
Common stock, par value (in USD per share)	$ 0.000001	$ 0.000001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	73,121,229	71,185,468
Common stock, shares outstanding (in shares)	73,121,229	71,185,468