Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Examination [Line Items]
Income tax expense / (benefit)	$ 91	$ (62)
Deferred tax assets valuation allowance	18,562	$ 12,120
Valuation allowance increase (decrease)	6,500
Decrease related to changes in deferred taxes	5,600
Valuation allowance, net operating loss	$ 900
Change in ownership percentage (more than)	50.00%
Stockholder ownership (or greater)	5.00%
Not Subject to Limitations
Income Tax Examination [Line Items]
Proceeds from sale of operating loss carryforward	$ 26,500
Subject to Limitations | Minimum
Income Tax Examination [Line Items]
Net operating losses	1,000
Subject to Limitations | Maximum
Income Tax Examination [Line Items]
Net operating losses	$ 2,300