Income Taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	14. Income Taxes The Company files income tax returns in the U.S., Korea, Japan, Taiwan and various other jurisdictions. The Company is subject to income- or non-income-based tax examinations by tax authorities of the U.S., Korea and multiple other foreign jurisdictions, where applicable, for all open tax years. Income tax expense recorded for three and six months ended June 30, 2018 were $1,521 thousand and was $2,511, respectively. Income tax expense recorded for three and six months ended June 30, 2017 were $538 thousand and was $1,391, respectively. The increase in income tax expenses was primarily attributable to income tax expense recorded for the Korean subsidiary, which is estimated to generate taxable income for the fiscal year ending December 31, 2018, combined with its ability to utilize net operating loss carryforwards up to 70% of taxable income for the year. On December 22, 2017, H.R. 1, originally known as the Tax Cuts and Jobs Act, was enacted in the U.S (the “Tax Reform Act”). The Tax Reform Act reduces the U.S. federal statutory rate to 21.0% from 35.0% effective January 1, 2018. The key provisions contained in the Tax Reform Act are mandatory deemed repatriation tax, global intangible low tax income and foreign derived intangible income provisions. The Company does not expect that the global intangible low tax income and foreign derived intangible income provisions will have any material impact to its income tax expense. The Company is currently reviewing the provision relating to the mandatory deemed repatriation tax and will complete its assessment before the measurement period ending in December 2018.

14. Income Taxes

The Company files income tax returns in the U.S., Korea, Japan, Taiwan and various other jurisdictions. The Company is subject to income- or non-income-based tax examinations by tax authorities of the U.S., Korea and multiple other foreign jurisdictions, where applicable, for all open tax years.

Income tax expense recorded for three and six months ended June 30, 2018 were $1,521 thousand and was $2,511, respectively. Income tax expense recorded for three and six months ended June 30, 2017 were $538 thousand and was $1,391, respectively. The increase in income tax expenses was primarily attributable to income tax expense recorded for the Korean subsidiary, which is estimated to generate taxable income for the fiscal year ending December 31, 2018, combined with its ability to utilize net operating loss carryforwards up to 70% of taxable income for the year.

On December 22, 2017, H.R. 1, originally known as the Tax Cuts and Jobs Act, was enacted in the U.S (the “Tax Reform Act”). The Tax Reform Act reduces the U.S. federal statutory rate to 21.0% from 35.0% effective January 1, 2018. The key provisions contained in the Tax Reform Act are mandatory deemed repatriation tax, global intangible low tax income and foreign derived intangible income provisions. The Company does not expect that the global intangible low tax income and foreign derived intangible income provisions will have any material impact to its income tax expense. The Company is currently reviewing the provision relating to the mandatory deemed repatriation tax and will complete its assessment before the measurement period ending in December 2018.