Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Allowance for credit loss, accounts receivable	$ 2,876	$ 2,736
Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, issued (in shares)	158,014,531	156,519,611
Common stock, outstanding (in shares)	158,014,531	156,519,611
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	50,000,000	50,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0