Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Net operating loss	$ 21,836	$ 14,060
Non-deductible interest expense	517	357
Debt issue costs	205	285
Stock-based compensation expense	1,901	1,213
Patent licenses	14	14
Research and development tax credit carryforward	396	396
Accrued expenses	552	371
Section 195 deferred start-up costs	24	28
Deferred tax assets	25,445	16,724
Depreciation	(19)	(16)
Deferred Tax Liabilities	(19)	(16)
Deferred tax assets, net of deferred tax liabilities	25,426	16,708
Less: valuation allowance	(25,426)	(16,708)
Deferred tax assets, net after valuation allowance