Condensed consolidated balance sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Accounts receivable, allowance for bad debts	$ 65	$ 111
Accumulated depreciation	$ 97,832	$ 73,621
Class A Common Stock
Stockholders’ equity (deficit):
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	80,473,000	78,525,000
Common stock, shares outstanding (in shares)	80,473,000	78,525,000
Class B Common Stock
Stockholders’ equity (deficit):
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	6,044,000	8,562,000
Common stock, shares outstanding (in shares)	6,044,000	8,562,000