Fair Value of Financial Instruments - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Total financial assets	$ 6,493	$ 10,493
Liabilities
Warrant liabilities	14,725	49,293
Total financial liabilities	14,725	49,293
Level 1
Assets
Total financial assets	6,493	10,493
Liabilities
Warrant liabilities	0	0
Total financial liabilities	0	0
Level 2
Assets
Total financial assets	0	0
Liabilities
Warrant liabilities	0	0
Total financial liabilities	0	0
Level 3
Assets
Total financial assets	0	0
Liabilities
Warrant liabilities	14,725	49,293
Total financial liabilities	14,725	49,293
Money Market Funds
Assets
Money market funds	6,493	10,493
Money Market Funds | Level 1
Assets
Money market funds	6,493	10,493
Money Market Funds | Level 2
Assets
Money market funds	0	0
Money Market Funds | Level 3
Assets
Money market funds	$ 0	$ 0