Related Party Transactions	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party TransactionsAt December 31, 2020, the Company had short-term, unsecured, interest free loans outstanding of approximately $0.6 million due to its executive chairman and approximately $3.7 million due to Jinzhuo Hengbang Technology (Beijing) Co., Ltd. (“Jinzhuo Hengbang”), an affiliated company of Sina Corporation, the ultimate parent company of one of the Company’s investors. Additionally, the Company paid a guarantee deposit of $3.7 million to Sina Corporation in connection with the loans borrowed by the Company from Jinzhuo Hengbang, which was outstanding at December 31, 2020. During the nine months ended September 30, 2021, the Company paid off these loans in their entirety, and received a refund of the guarantee deposit paid to Sina Corporation.