Condensed Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Accounts receivable, net of allowance	$ 2,066	$ 2,207
Redeemable Convertible Preferred Stock , Par or Stated Value Per Share		$ 0.001
Redeemable Convertible Preferred Stock , Shares Authorized		60,137,979
Redeemable Convertible Preferred Stock , Shares Issued		39,223,194
Redeemable Convertible Preferred Stock , Shares Outstanding		39,223,194
Treasury Stock Acquired, Average Cost Per Share	$ 2.86	$ 2.86
Treasury Stock, Shares, Acquired	8,195,464	8,195,464
Series A Common Stock [Member]
Common Stock, Par or Stated Value Per Share		$ 0.001
Common Stock, Shares Authorized		204,220,800
Common Stock, Shares, Issued		112,012,693
Common stock, shares, outstanding		112,012,693
Series B Common Stock [Member]
Common Stock, Par or Stated Value Per Share		$ 0.001
Common Stock, Shares Authorized		3,400,000
Common Stock, Shares, Issued		3,054,318
Common stock, shares, outstanding		3,054,318
Common Class A [Member]
Common Stock, Par or Stated Value Per Share	$ 0.001
Common Stock, Shares Authorized	3,750,000,000
Common Stock, Shares, Issued	152,270,401
Common stock, shares, outstanding	152,270,401
Common Class B [Member]
Common Stock, Par or Stated Value Per Share	$ 0.001
Common Stock, Shares Authorized	50,000,000
Common Stock, Shares, Issued	37,856,095
Common stock, shares, outstanding	37,856,095