Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets
Net operating losses	$ 14,827	$ 8,748
Intangibles	187	205
Accrued expenses	271	198
Equity-based compensation	796	728
Deferred revenue	0	295
Other	204	0
Less: Valuation allowance	(16,225)	(10,166)
Total deferred tax assets	60	8
Deferred Tax Liabilities
Fixed assets and other	(60)	(8)
Total deferred tax liabilities	(60)	(8)
Deferred taxes, net	$ 0	$ 0