XML 51 R31.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Income Taxes (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Reconciliation of Statutory Federal Income Tax Rate to the Company's Effective Tax Rate | The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate:
|  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Expected income tax provision at the federal statutory rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State taxes, net of federal benefit |  |  | 0.3 |  |  |  | (3.8 | ) |  |  | 4.6 |
Change in valuation allowance |  |  | (36.2 | ) |  |  | (30.7 | ) |  |  | (17.9 | )
Nondeductible expenses |  |  | — |  |  |  | — |  |  |  | (20.6 | )
Tax credits |  |  | 0.3 |  |  |  | 1.3 |  |  |  | — |
Other |  |  | 0.6 |  |  |  | (1.7 | ) |  |  | (3.2 | )
Income tax provision |  |  | 0.0 | % |  |  | 0.1 | % |  |  | (2.1 | %)
Significant Components of the Company's Deferred Tax Assets | Significant components of the Company’s deferred tax assets are as follows:
|  | December 31, |
|  | 2016 |  |  | 2015 |
|  | (in thousands) |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 68,639 |  |  | $ | 30,572 |
Research credits |  |  | 2,643 |  |  |  | 1,919 |
Stock awards |  |  | 2,583 |  |  |  | 1,011 |
Other |  |  | 1,558 |  |  |  | 571 |
Gross deferred tax assets |  |  | 75,423 |  |  |  | 34,073 |
Valuation allowance |  |  | (74,520 | ) |  |  | (33,845 | )
Total deferred tax assets |  |  | 903 |  |  |  | 228 |
Deferred tax liabilities |  |  | (903 | ) |  |  | (228 | )
Net deferred tax assets |  | $ | — |  |  | $ | — |
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
|  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (in thousands) |
Balance at beginning of year |  | $ | 3,298 |  |  | $ | 2,815 |  |  | $ | 1,411 |
Additions (subtractions) based on tax positions related to prior year |  |  | 45 |  |  |  | (58 | ) |  |  | 405 |
Additions based on tax positions related to current year |  |  | 549 |  |  |  | 541 |  |  |  | 999 |
Balance at end of year |  | $ | 3,892 |  |  | $ | 3,298 |  |  | $ | 2,815 |

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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=65882285&loc=d3e32537-109319 + Details
Name: | us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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=65882285&loc=d3e32687-109319 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=75116239&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
Name: | us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration