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Income Taxes | 12 Months Ended
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Dec. 31, 2016
Income Taxes [Abstract] |
Income Taxes | 8. Income Taxes ﻿ We did not provide for income taxes in 2016 and 2015 because we had a net operating loss for tax purposes in those years and the tax benefit that would have resulted from the statutory rate was fully offset by the valuation allowance. ﻿ ﻿ Deferred tax assets and valuation allowance ﻿ Deferred tax assets reflect the tax effects of net operating loss and tax credit carryforwards and temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. We offset our deferred tax assets by a valuation allowance because we are uncertain about the timing and amount of any future profits. Significant components of our deferred tax assets are as follows (in thousands): ﻿
﻿ |  |  |  |  |
﻿ | December 31,
﻿ | 2016 |  | 2015
﻿Deferred tax assets: |  |  |  |  |
﻿Net operating loss carryforwards | $ | 22,300 |  | $ | 17,100
﻿Stock-related compensation |  | 9,100 |  |  | 10,600
﻿Research & development credit carryforwards |  | 6,200 |  |  | 6,000
﻿Other |  | 200 |  |  | 500
﻿ |  | 37,800 |  |  | 34,200
﻿Valuation allowance |  | (37,800) |  |  | (34,200)
﻿ | $ | — |  | $ | —
﻿ |  |  |  |  |
As of the beginning of 2016, we increased both our net operating loss carryforwards and our valuation allowance by $0.9 million when we adopted ASU 2016-09 for certain tax deductions associated with stock option transactions greater than the stock-related compensation expense in our financial statements. The valuation allowance increased by $3.6 million in 2016 and $3.4 million in 2015. ﻿ Our pre-tax net opera ting loss carryforwards of $65.6 million are federal and expire between 2029 and 2036. As of December 31, 2016, we had federal research and development t ax credits of approximately $10.4 million, which expire in the years 2023 through 2036. ﻿ Unrecognized tax benefits ﻿ We have unrecognized tax benefits related to tax credits. We added to our unrecognized tax benefits in 2016 and 2015 as follows (in thousands): ﻿
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | 2016 |  | 2015
﻿Beginning balance | $ | 4,000 |  | $ | 3,900
﻿Additions based on tax positions related to the current year |  | 200 |  |  | 100
﻿Ending balance | $ | 4,200 |  | $ | 4,000
﻿ |  |  |  |  |
﻿

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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