CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,245	$ 575
Redeemable convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Redeemable convertible preferred stock, shares authorized (in shares)	0	58,615,000
Redeemable convertible preferred stock, shares issued (in shares)	0	58,615,000
Redeemable convertible preferred stock, shares outstanding (in shares)	0	58,615,000
Aggregate liquidation preference	$ 0	$ 237,650
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	100,000,000	0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	900,000,000	99,250,000
Common stock, shares issued (in shares)	95,301,000	17,691,000
Common stock, shares outstanding (in shares)	95,301,000	17,691,000