Concentration of risks
Concentration of credit risk. Financial instruments that potentially subject the Group to a concentration of credit risk consist primarily of cash and cash equivalents, short-term investments and accounts receivable. In addition, with the majority of its operations in China, the Group is subject to RMB currency risk and offshore remittance risk, both of which have been difficult to hedge and the Group has not done so. The Group limits its exposure to credit loss by depositing its cash and cash equivalents with financial institutions in the US, PRC and Hong Kong, which are among the largest and most respected financial institution with high ratings from internationally-recognized rating agencies, that management believes are of high credit quality. The Group periodically reviews these institutions’ reputations, track records and reported reserves.
As of December 31, 2020 and June 30, 2021, the Group had $3.0 billion and $2.4 billion, respectively, in cash and bank time deposits (with terms generally up to twelve months) with large domestic banks in China. China promulgated a Bankruptcy Law that came into effect on June 1, 2007, which contains a separate article expressly stating that the State Council may promulgate implementation measures for the bankruptcy of Chinese banks based on the Bankruptcy Law. Under the Bankruptcy Law, a Chinese bank may go bankrupt. In addition, since China’s concession to WTO, foreign banks have been gradually permitted to operate in China and have become significant competitors to Chinese banks in many aspects, especially since the opening of RMB business to foreign banks in late 2006. Therefore, the risk of bankruptcy on Chinese banks in which the Group holds cash and bank deposits has increased. In the event that a Chinese bank that holds the Group’s deposits goes bankrupt, the Group is unlikely to claim its deposits back in full, since it is unlikely to be classified as a secured creditor to the bank under the PRC laws.
Alibaba, as an advertiser, accounted for 9% and 7% of the Group’s total revenues for the six months ended June 30, 2020 and 2021, respectively. No customer nor advertising agency accounted for 10% or more of the Group’s revenues. The Group’s top 10 advertising agencies contributed to 33% and 38% of the Group’s revenues for the six months ended June 30, 2020 and 2021, respectively.
As of December 31, 2020 and June 30, 2021, substantially all accounts receivable were derived from the Group’s China operations. Excluding accounts receivable due from Alibaba and other related parties, accounts receivable primarily consist of amounts due from advertising agencies and direct customers. Alibaba accounted for 28% and 19% of the Group's net accounts receivable as of December 31, 2020 and June 30, 2021, respectively.
Concentration of foreign currency risks. The majority of the Group’s operations were in RMB. As of December 31, 2020 and June 30, 2021, the Group’s cash, cash equivalents and short-term investments balance denominated in RMB was $1,651.3 million and $1,451.6 million, accounting for 47% and 49% of the Group’s total cash, cash equivalents and short-term investments balance at the respective dates. As of December 31, 2020 and June 30, 2021, the Group’s aggregate net accounts receivable balance (including accounts receivable due from third parties, Alibaba and other related parties) denominated in RMB was $492.0 million and $631.2 million, respectively, accounting for almost all of its net accounts receivable balance. As of December 31, 2020 and June 30, 2021, the Group’s current liabilities balance denominated in RMB was $947.6 million and $1,064.1 million, accounting for 99% and 97% of its total current liabilities balance. Accordingly, the Group may experience economic losses and negative impacts on earnings and equity as a result of exchange rate fluctuations of the RMB against the U.S. dollars. Moreover, the Chinese government imposes controls on the convertibility of the RMB into foreign currencies and, in certain cases, the remittance of currency out of the PRC. The Group may experience difficulties in completing the administrative procedures necessary to remit its RMB out of the PRC and convert it into foreign currency.
Recent accounting pronouncements
In May 2021, the FASB issued ASU No. 2021-04, Earnings Per Share (Topic 260), Debt — Modifications and Extinguishments (Subtopic 470-50), Compensation — Stock Compensation (Topic 718), and Derivatives and Hedging — Contracts in Entity’s Own Equity (Subtopic 815-40) to clarify and reduce diversity in an issuer’s accounting for modifications or exchanges of freestanding equity-classified written call options (for example, warrants) that remain equity classified after modification or exchange. The amendments in this update are effective for all entities for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. An entity should apply the amendments prospectively to modifications or exchanges occurring on or after the effective date of the amendments. The ASU is currently not expected to have a material impact on the consolidated financial statements.