| Income Tax Disclosure [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Income Tax Disclosure [Abstract] | |
Schedule of income before income tax, domestic and foreign | For financial reporting purposes, income (loss) before income taxes for the years ended December 31, 2016, 2015 and 2014 include the following components (in thousands): | | | | | | | | | | | | | | Years ended December 31, | | 2016 | | 2015 | | 2014 | Income (loss) from continuing operations before income taxes: | | | | | | U.S. | $ | (51,576 | ) | | $ | (50,155 | ) | | $ | (40,328 | ) | Non‑U.S. | (5,949 | ) | | (7,050 | ) | | (5,353 | ) | | $ | (57,525 | ) | | $ | (57,205 | ) | | $ | (45,681 | ) |
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Schedule of components of income tax expense (benefit) | Significant components of the provision for income taxes for the years ended December 31, 2016, 2015 and 2014 were as follows (in thousands): | | | | | | | | | | | | | | Years ended December 31, | | 2016 | | 2015 | | 2014 | Current: | | | | | | Federal | $ | — |
| | $ | — |
| | $ | — |
| State | — |
| | — |
| | — |
| Foreign | 63 |
| | 41 |
| | 41 |
| | 63 |
| | 41 |
| | 41 |
| Deferred: | | | | | | Federal | — |
| | — |
| | — |
| State | — |
| | — |
| | — |
| Foreign | — |
| | — |
| | — |
| |
|
| |
|
| | | Total | $ | 63 |
| | $ | 41 |
| | $ | 41 |
|
|
Schedule of effective income tax rate reconciliation | A reconciliation of the income tax expense (benefit) at the statutory federal income tax rate as reflected in the financial statements was as follows: | | | | | | | | | | | Years ended December 31, | | 2016 | | 2015 | | 2014 | Tax at U.S. statutory rate | (34.00 | )% | | (34.00 | )% | | (34.00 | )% | State taxes, net of federal benefits | (2.70 | ) | | (2.27 | ) | | (2.36 | ) | Permanent items | 0.42 |
| | 1.52 |
| | 1.46 |
| Tax credit | (1.06 | ) | | (0.85 | ) | | (8.59 | ) | Change in valuation allowance | 33.95 |
| | 31.07 |
| | 37.49 |
| Foreign rate differential | 1.04 |
| | 1.68 |
| | 0.68 |
| Rate change | (0.06 | ) | | 0.01 |
| | (0.02 | ) | Uncertain tax positions | 2.06 |
| | 2.21 |
| | 2.97 |
| Other | 0.46 |
| | 0.7 |
| | 2.47 |
| | 0.11 | % | | 0.07 | % | | 0.10 | % |
|
Schedule of deferred tax assets and liabilities | Significant components of the Company’s deferred tax assets (liabilities) consisted of the following (in thousands): | | | | | | | | | | Years ended December 31, | | 2016 | | 2015 | Deferred tax assets: | | | | Federal and state net operating loss carryforwards | $ | 115,719 |
| | $ | 99,823 |
| Foreign net operating loss carryforwards | 2,561 |
| | 2,973 |
| Accrued expenses | 280 |
| | — |
| Credits | 5,091 |
| | 4,483 |
| Deferred revenue | 1,709 |
| | — |
| Other | 5,703 |
| | 4,138 |
| Total deferred tax assets | 131,063 |
| | 111,417 |
| Valuation allowance | (130,005 | ) | | (110,518 | ) | Net deferred tax assets | 1,058 |
| | 899 |
| Deferred tax liabilities: | | | | Fixed assets | (841 | ) | | (612 | ) | Intangibles | (217 | ) | | (287 | ) | Other | — |
| | — |
| Net deferred tax liabilities | (1,058 | ) | | (899 | ) | Net deferred tax assets | $ | — |
| | $ | — |
| Current net deferred tax asset | 33 |
| | 15 |
| Long‑term net deferred tax liability | (33 | ) | | (15 | ) | Net deferred tax asset | $ | — |
| | $ | — |
|
|
Schedule of unrecognized tax benefits | Unrecognized tax benefits during the three years ended December 31, 2016, 2015 and 2014 consisted of the following: | | | | | | | | | | | | | | Years ended December 31, | | 2016 | | 2015 | | 2014 | Unrecognized tax benefits beginning of year | $ | 3,730 |
| | $ | 2,466 |
| | $ | 1,109 |
| Gross change for current year positions | 1,187 |
| | 1,264 |
| | 1,357 |
| Decrease for prior period positions | — |
| | — |
| | — |
| Decrease due to settlements and payments | — |
| | — |
| | — |
| Decrease due to statute limitations | — |
| | — |
| | — |
| Unrecognized tax benefits end of the year | $ | 4,917 |
| | $ | 3,730 |
| | $ | 2,466 |
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