Income Taxes	6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes The Company did not record a provision for U.S. federal income taxes for the three and six months ended June 30, 2017 because it expects to generate a loss for the year ended December 31, 2017. The income tax expense of $37,000 and $71,000 for the three and six months ended June 30, 2017, and $14,000 and $22,000 for the three and six months ended June 30, 2016, represented foreign taxes. Utilization of the Company’s net operating loss and research and development credit carryforwards to offset taxable income are subject to an annual limitation, pursuant to Internal Revenue Code (IRC) Sections 382 and 383. As a result of stock offerings that occurred prior to 2016, subsequent changes in the stock ownership, and the stock offering in February 2017, an ownership change under Section 382 is deemed to have occurred. As such, all of the accumulated U.S. federal and state operating loss carryforwards and the net tax credit carryforwards incurred prior to the ownership change will not be available for future use. The loss of these attributes does not have any impact on the financial statements since the net U.S. deferred tax assets are offset by a full valuation allowance.

9. Income Taxes

The Company did not record a provision for U.S. federal income taxes for the three and six months ended June 30, 2017 because it expects to generate a loss for the year ended December 31, 2017. The income tax expense of $37,000 and $71,000 for the three and six months ended June 30, 2017, and $14,000 and $22,000 for the three and six months ended June 30, 2016, represented foreign taxes.

Utilization of the Company’s net operating loss and research and development credit carryforwards to offset taxable income are subject to an annual limitation, pursuant to Internal Revenue Code (IRC) Sections 382 and 383. As a result of stock offerings that occurred prior to 2016, subsequent changes in the stock ownership, and the stock offering in February 2017, an ownership change under Section 382 is deemed to have occurred. As such, all of the accumulated U.S. federal and state operating loss carryforwards and the net tax credit carryforwards incurred prior to the ownership change will not be available for future use. The loss of these attributes does not have any impact on the financial statements since the net U.S. deferred tax assets are offset by a full valuation allowance.