| 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 | The domestic and foreign components of loss before provision for incomes taxes were as follows (in thousands): | | | | | | | | | | | | | | | | Years Ended December 31, | | | 2016 | | 2015 | | 2014 | Domestic | | $ | (28,931 | ) | | $ | (27,674 | ) | | $ | (21,495 | ) | Foreign | | 1,876 |
| | 1,876 |
| | 1,262 |
| Loss before provision for income taxes | | $ | (27,055 | ) | | $ | (25,798 | ) | | $ | (20,233 | ) |
|
Schedule of Components of Income Tax Expense (Benefit) | Provision for income taxes consisted of the following for the periods indicated (in thousands): | | | | | | | | | | | | | | | | Years Ended December 31, | | | 2016 | | 2015 | | 2014 | Current: | | | | | | | State | | $ | 102 |
| | $ | 90 |
| | $ | 104 |
| Foreign | | 673 |
| | 493 |
| | 469 |
| Current income tax | | 775 |
| | 583 |
| | 573 |
| Deferred: | | | | | | | Foreign | | (428 | ) | | (48 | ) | | 8 |
| Deferred income tax | | (428 | ) | | (48 | ) | | 8 |
| Provision for income taxes | | $ | 347 |
| | $ | 535 |
| | $ | 581 |
|
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Schedule of Effective Income Tax Rate Reconciliation | The differences between the statutory tax rate and the effective tax rate, expressed as a percentage of loss before income taxes, were as follows: | | | | | | | | | | | | | Years Ended December 31, | | | 2016 | | 2015 | | 2014 | Federal statutory rate | | 34.0 | % | | 34.0 | % | | 34.0 | % | State statutory rate | | 6.1 | % | | 2.6 | % | | 2.5 | % | Foreign operations | | 0.6 | % | | 1.1 | % | | (0.1 | )% | R&D tax credits | | 6.4 | % | | 11.2 | % | | 9.2 | % | Foreign income inclusion | | (0.7 | )% | | (2.4 | )% | | (0.3 | )% | Non-deductible stock compensation | | (5.1 | )% | | (1.9 | )% | | (0.9 | )% | Other permanent items | | (1.4 | )% | | (2.0 | )% | | (1.5 | )% | Tax true-up | | 21.0 | % | | (1.3 | )% | | (0.2 | )% | Valuation allowance | | (62.2 | )% | | (43.4 | )% | | (45.6 | )% | Effective tax rate | | (1.3 | )% | | (2.1 | )% | | (2.9 | )% |
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Schedule of Deferred Tax Assets and Liabilities | The significant components of the Company's deferred tax assets and liabilities were as follows (in thousands): | | | | | | | | | | | | As of December 31, | | | 2016 | | 2015 | Deferred tax assets: | | | | | Net operating loss carryforwards | | $ | 167,668 |
| | $ | 167,387 |
| Tax credit carryforwards | | 36,026 |
| | 27,654 |
| Depreciation and amortization | | 2,538 |
| | 1,947 |
| Accruals and reserves | | 13,462 |
| | 12,427 |
| Deferred revenue | | 12,954 |
| | 9,822 |
| Stock-based compensation | | 6,159 |
| | 5,198 |
| Other | | 1,124 |
| | 528 |
| Gross deferred tax assets | | 239,931 |
| | 224,963 |
| Valuation allowance | | (239,238 | ) | | (222,410 | ) | Net deferred tax assets | | 693 |
| | 2,553 |
| Deferred tax liabilities: | | | | | Intangible assets | | (157 | ) | | (2,229 | ) | Other | | — |
| | (130 | ) | Gross deferred tax liabilities | | (157 | ) | | (2,359 | ) | Net deferred tax assets reflected in balance sheet | | $ | 536 |
| | $ | 194 |
|
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Unrecognized Tax Benefits Activity | The following table reconciles the Company's unrecognized tax benefits for the years ended December 31, 2016 and 2015 (in thousands): | | | | | | | | | | | | Years Ended December 31, | | | 2016 | | 2015 | Balance at beginning of period | | $ | 16,597 |
| | $ | 15,421 |
| Additions for tax positions related to prior year | | 420 |
| | 56 |
| Reductions for tax positions related to prior year | | (145 | ) | | (59 | ) | Additions for tax positions related to current year | | 1,477 |
| | 1,179 |
| Balance at end of period | | $ | 18,349 |
| | $ | 16,597 |
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