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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2014 | Dec. 31, 2013
Operating Loss Carryforwards [Line Items] |  |  |  |
Accrued interest and penalties related to uncertain tax positions | $ 0 |  | $ 0 |
Deferred tax assets, operating loss carry-forwards | 5,384,000 |  | $ 6,871,000 | $ 3,989,000
Operating loss carry-forwards, subject to expiration | 54,300,000 |  |  |
Scenario, forecast |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carry-forwards |  | $ 6,000,000 |  |
Research tax credit carry-forward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carry-forwards | 299,000 |  |  |
Domestic tax authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforward utilized | 6,200,000 |  |  |
Operating loss carry-forwards | 69,100,000 |  |  |
Deferred tax assets, operating loss carry-forwards | $ 14,800,000 |  |  |

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