Accrued Expenses and Long-term Liabilities - Schedule of Long Term Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Warrant liability	$ 62	$ 21
Uncertain tax positions	4,396	4,342
Deferred revenue	123	136
Other	111	138
Total other long-term liabilities	$ 4,692	$ 4,637