UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 2,213	$ 2,077
Redemption amount	$ 23,138	$ 23,138
Preferred stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Preferred stock, shares authorized (in shares)	49,995,966	49,995,966
Preferred stock, shares issued (in shares)	217.67	217.67
Preferred stock, shares outstanding (in shares)	217.67	217.67
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares outstanding (in shares)	142,206,226	140,268,725
Common stock, shares issued (in shares)	142,206,226	140,268,725

Amount of allowance for credit loss on accounts receivable, classified as current.

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