Income Taxes	9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company provides for income taxes at the end of each interim period based on the estimated effective tax rate for the full year in addition to discrete events which impact the interim period. The Company’s effective tax rate differs from the U.S. statutory rate principally due to the change in valuation allowance and the rate impact of uncertain tax positions. Cumulative adjustments to the tax provision are recorded in the interim period in which a change in the estimated annual effective tax rate is determined. The Company’s tax provision was $0.8 million and $20,000 for the three months ended September 30, 2017 and 2016, respectively, and $2.1 million and $0.7 million for the nine months ended September 30, 2017 and 2016, respectively. The Company regularly assesses its ability to realize its deferred tax assets. Assessing the realizability of deferred tax assets requires significant management judgment. In determining whether its deferred tax assets are more-likely-than-not realizable, the Company evaluated all available positive and negative evidence, and weighed the objective evidence and expected impact. Evidence the Company considered included its history of net operating losses, which resulted in the Company recording a full valuation allowance against its domestic net deferred tax assets beginning in 2011, and in each year thereafter. The Company was profitable on a cumulative basis for the three-year period ended September 30, 2017, but substantially all of that profitability was achieved during 2016 and the nine months ended September 30, 2017. The Company continues to evaluate other negative evidence including customer concentration and contractual risk, DEFINITY supplier risk, the risk of Moly supply availability and cost, and certain product development risks, all of which provide for uncertainties around the Company’s future level of profitability. Based on its review of all available evidence, the Company determined that it has not yet attained a sustained level of profitability sufficient to outweigh the objectively verifiable negative evidence, and has recorded a full valuation allowance against its domestic net deferred tax assets at September 30, 2017. The Company will continue to assess the level of the valuation allowance required. If a sufficient weight of positive evidence exists in future periods to support a release of some or all of the valuation allowance recorded against domestic deferred tax assets, such a release would likely have a material impact on the Company’s results of operations in that future period. In connection with the Company’s acquisition of the medical imaging business from Bristol-Myers Squibb (“BMS”) in 2008, the Company entered into a tax indemnification agreement with BMS related to certain tax obligations arising prior to the acquisition of the Company, for which the Company has the primary legal obligation. The tax indemnification receivable is recognized within other long-term assets. The changes in the tax indemnification asset are recognized within other income in the condensed consolidated statement of operations. In accordance with the Company’s accounting policy, the change in the contingent tax liability, and penalties and interest associated with these obligations (net of any offsetting federal or state benefit) is recognized within the tax provision. Accordingly, as these reserves change, adjustments are included in the tax provision while the offsetting adjustment is included in other income. Assuming that the receivable from BMS continues to be considered recoverable by the Company, there is no net effect on earnings related to these liabilities and no net cash outflows.

Income Taxes

The Company provides for income taxes at the end of each interim period based on the estimated effective tax rate for the full year in addition to discrete events which impact the interim period. The Company’s effective tax rate differs from the U.S. statutory rate principally due to the change in valuation allowance and the rate impact of uncertain tax positions. Cumulative adjustments to the tax provision are recorded in the interim period in which a change in the estimated annual effective tax rate is determined. The Company’s tax provision was $0.8 million and $20,000 for the three months ended September 30, 2017 and 2016, respectively, and $2.1 million and $0.7 million for the nine months ended September 30, 2017 and 2016, respectively.

The Company regularly assesses its ability to realize its deferred tax assets. Assessing the realizability of deferred tax assets requires significant management judgment. In determining whether its deferred tax assets are more-likely-than-not realizable, the Company evaluated all available positive and negative evidence, and weighed the objective evidence and expected impact. Evidence the Company considered included its history of net operating losses, which resulted in the Company recording a full valuation allowance against its domestic net deferred tax assets beginning in 2011, and in each year thereafter. The Company was profitable on a cumulative basis for the three-year period ended September 30, 2017, but substantially all of that profitability was achieved during 2016 and the nine months ended September 30, 2017.

The Company continues to evaluate other negative evidence including customer concentration and contractual risk, DEFINITY supplier risk, the risk of Moly supply availability and cost, and certain product development risks, all of which provide for uncertainties around the Company’s future level of profitability. Based on its review of all available evidence, the Company determined that it has not yet attained a sustained level of profitability sufficient to outweigh the objectively verifiable negative evidence, and has recorded a full valuation allowance against its domestic net deferred tax assets at September 30, 2017. The Company will continue to assess the level of the valuation allowance required. If a sufficient weight of positive evidence exists in future periods to support a release of some or all of the valuation allowance recorded against domestic deferred tax assets, such a release would likely have a material impact on the Company’s results of operations in that future period.

In connection with the Company’s acquisition of the medical imaging business from Bristol-Myers Squibb (“BMS”) in 2008, the Company entered into a tax indemnification agreement with BMS related to certain tax obligations arising prior to the acquisition of the Company, for which the Company has the primary legal obligation. The tax indemnification receivable is recognized within other long-term assets. The changes in the tax indemnification asset are recognized within other income in the condensed consolidated statement of operations. In accordance with the Company’s accounting policy, the change in the contingent tax liability, and penalties and interest associated with these obligations (net of any offsetting federal or state benefit) is recognized within the tax provision. Accordingly, as these reserves change, adjustments are included in the tax provision while the offsetting adjustment is included in other income. Assuming that the receivable from BMS continues to be considered recoverable by the Company, there is no net effect on earnings related to these liabilities and no net cash outflows.