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 |