Income Taxes - Schedule of Tax Effects of Temporary Differences Give Rise to Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal losses carryforward	$ 20,251	$ 8,454
Intangible assets	4,210	4,470
State losses carryforward	2,260	1,246
Other	1,543	1,262
Stock compensation	844	1,128
Other tax credits	713	502
Fixed assets	488	309
Deferred tax asset	30,309	17,371
Prepaid expenses		(224)
Deferred tax liability		(224)
Valuation allowance	$ (30,309)	$ (17,147)