Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate differs from the statutory U.S. federal income tax rate of 21% primarily due to foreign income tax and the valuation allowance against our domestic deferred tax assets. The Company recorded an income tax provision of $14,000 and $126,000 for the three months ended March 31, 2019 and 2018, respectively. The Company’s income taxes are primarily related to Chinese income taxes related to a specialized services contract. As of March 31, 2019, the Company has a cumulative valuation allowance recorded offsetting its worldwide net deferred tax assets of $67.0 million, of which the significant majority represents the valuation allowance on its U.S. net deferred tax asset. The Company has established a valuation allowance against its U.S. federal and state deferred tax assets due to the uncertainty surrounding the realization of such assets. Management periodically evaluates the recoverability of the deferred tax assets and at such time as it is determined that it is more likely than not that U.S. deferred tax assets are realizable, the valuation allowance will be reduced accordingly.

Income Taxes

3 Months Ended

Mar. 31, 2019

The effective tax rate differs from the statutory U.S. federal income tax rate of 21% primarily due to foreign income tax and the valuation allowance against our domestic deferred tax assets.

The Company recorded an income tax provision of $14,000 and $126,000 for the three months ended March 31, 2019 and 2018, respectively. The Company’s income taxes are primarily related to Chinese income taxes related to a specialized services contract.

As of March 31, 2019, the Company has a cumulative valuation allowance recorded offsetting its worldwide net deferred tax assets of $67.0 million, of which the significant majority represents the valuation allowance on its U.S. net deferred tax asset. The Company has established a valuation allowance against its U.S. federal and state deferred tax assets due to the uncertainty surrounding the realization of such assets. Management periodically evaluates the recoverability of the deferred tax assets and at such time as it is determined that it is more likely than not that U.S. deferred tax assets are realizable, the valuation allowance will be reduced accordingly.