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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Taxes [Abstract] |
Summary of Detail of Deferred Tax Assets and Liabilities |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | 2017 |  | 2016
﻿Deferred tax assets (liabilities): |  |  |  |  |  |
﻿Net operating loss carryforward |  | $ | 64,776 |  | $ | 84,056
﻿Research and development and AMT credit carryforwards, net |  |  | 5,339 |  |  | 5,446
﻿Equity compensation |  |  | 6,955 |  |  | 8,406
﻿Accruals and reserves |  |  | 874 |  |  | 914
﻿Inventories |  |  | 588 |  |  | 1,503
﻿Intangible assets |  |  | (11,297) |  |  | (16,922)
﻿Property and equipment, net |  |  | (339) |  |  | (1,487)
﻿Other, net |  |  | 179 |  |  | 66
﻿Subtotal |  |  | 67,075 |  |  | 81,982
﻿Less valuation allowance |  |  | (66,973) |  |  | (81,982)
﻿Total |  | $ | 102 |  | $ | —
﻿
Summary Of Company's Provision for Income Taxes |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Current Tax Expense |  |  |  |  |  |  |  |  |
﻿Federal |  | $ | — |  | $ | — |  | $ | 2
﻿State |  |  | 44 |  |  | 32 |  |  | 34
﻿Foreign |  |  | 72 |  |  | 8 |  |  | —
﻿Total current tax expense |  |  | 116 |  |  | 40 |  |  | 36
﻿Deferred Tax Expense |  |  |  |  |  |  |  |  |
﻿Federal |  | $ | 18,485 |  | $ | (7,333) |  | $ | (7,154)
﻿State |  |  | (1,337) |  |  | 210 |  |  | (398)
﻿Foreign |  |  | (2,241) |  |  | (1,177) |  |  | (955)
﻿Change in valuation allowance |  |  | (15,009) |  |  | 8,300 |  |  | 8,507
﻿Total deferred tax expense |  |  | (102) |  |  | — |  |  | —
﻿Total tax expense |  | $ | 14 |  | $ | 40 |  | $ | 36
﻿
Summary Of Difference Between Effective Income Tax Rates and Federal Statutory Rate |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Federal tax at statutory rate |  | 34.00 | % |  | $ | (9,139) |  | 34.00 | % |  | $ | (11,322) |  | 34.00 | % |  | $ | (9,240)
﻿Federal tax rate change |  | (109.68) |  |  |  | 29,480 |  |  |  |  |  |  |  |  |  |  |  |
﻿Federal R&D credit |  | (0.40) |  |  |  | 107 |  | 2.89 |  |  |  | (962) |  | 3.23 |  |  |  | (878)
﻿Federal NOL adjustment for ASU |  | 10.48 |  |  |  | (2,816) |  |  |  |  |  |  |  |  |  |  |  |
﻿Valuation allowance |  | 55.84 |  |  |  | (15,009) |  | (24.93) |  |  |  | 8,300 |  | (31.30) |  |  |  | 8,507
﻿State income taxes |  | 4.81 |  |  |  | (1,292) |  | (0.69) |  |  |  | 231 |  | 1.38 |  |  |  | (375)
﻿Foreign NOL rate change |  | 1.30 |  |  |  | (348) |  | (1.36) |  |  |  | 452 |  | (2.02) |  |  |  | 549
﻿Foreign tax rate differential |  | (2.45) |  |  |  | 658 |  | (1.62) |  |  |  | 539 |  | (1.99) |  |  |  | 542
﻿Permanent differences and other |  | 6.05 |  |  |  | (1,627) |  | (8.41) |  |  |  | 2,802 |  | (3.43) |  |  |  | 931
﻿Effective tax rate |  | (0.05) | % |  | $ | 14 |  | (0.12) | % |  | $ | 40 |  | (0.13) | % |  | $ | 36
﻿
Summary Of Reconciliation of Change in Federal and State Unrecognized Tax Benefits |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Balance at the beginning of the year |  | $ | 3,175 |  | $ | 1,982 |  | $ | 1,982
﻿Increases (decreases) for prior year tax positions |  |  | (2,018) |  |  | 1,193 |  |  | —
﻿Increases (decreases) for current year tax positions |  |  | — |  |  | — |  |  | —
﻿Increases (decreases) related to settlements |  |  | — |  |  | — |  |  | —
﻿Decreases related to statute lapse |  |  | — |  |  | — |  |  | —
﻿Balance at the end of the year |  | $ | 1,157 |  | $ | 3,175 |  | $ | 1,982
﻿

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: 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=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: 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=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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