Equity Method Investment	12 Months Ended
Dec. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investment	17. Equity Method Investment Investment in eREX Spark Marketing Co., Ltd Prior to November 2019, we, together with eREX Co., Ltd., a Japanese company, were party to an agreement ("eREX JV Agreement") for a joint venture, eREX Spark Marketing Co., Ltd ("ESM"). As part of this agreement, we made contributions of 156.4 million Japanese Yen, or $1.4 million, for a 20% ownership interest in ESM. We were entitled to share in 30% of the dividends distributed by ESM for the first year a qualifying dividend was paid and for the subsequent four years thereafter. After this period, dividends were to be distributed proportionately with the equity ownership of ESM. ESM's board of directors consists of four directors, one of whom was appointed by us. In November 2019, Spark HoldCo, LLC entered into a share purchase agreement with eREX Co., Ltd. In accordance with the agreement, Spark HoldCo, LLC sold its shares which represented 20% ownership interest in ESM for $8.4 million. The disposal of ESM resulted in a non-recurring gain of $4.9 million for the year ended December 31, 2019. Based on our significant influence, as reflected by the 20% equity ownership and 25% control of the ESM board of directors, we recorded the investment in ESM as an equity method investment.

Equity Method Investment

12 Months Ended

Dec. 31, 2021

Equity Method Investments and Joint Ventures [Abstract]

17. Equity Method Investment

Investment in eREX Spark Marketing Co., Ltd

Prior to November 2019, we, together with eREX Co., Ltd., a Japanese company, were party to an agreement ("eREX JV Agreement") for a joint venture, eREX Spark Marketing Co., Ltd ("ESM"). As part of this agreement, we made contributions of 156.4 million Japanese Yen, or $1.4 million, for a 20% ownership interest in ESM. We were entitled to share in 30% of the dividends distributed by ESM for the first year a qualifying dividend was paid and for the subsequent four years thereafter. After this period, dividends were to be distributed proportionately with the equity ownership of ESM. ESM's board of directors consists of four directors, one of whom was appointed by us. In November 2019, Spark HoldCo, LLC entered into a share purchase agreement with eREX Co., Ltd. In accordance with the agreement, Spark HoldCo, LLC sold its shares which represented 20% ownership interest in ESM for $8.4 million. The disposal of ESM resulted in a non-recurring gain of $4.9 million for the year ended December 31, 2019. Based on our significant influence, as reflected by the 20% equity ownership and 25% control of the ESM board of directors, we recorded the investment in ESM as an equity method investment.