Income Taxes - Summary of Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
U.S. federal income taxes at the statutory rate	$ (1,533)	$ (1,630)
State taxes, net of federal effects	(122)	(130)
UK Anti-Hybrid expense addback	289	397
Transaction costs	0	74
Goodwill impairment	114	473
Section 382 Limitation	0	(7,448)
Adjustment to NOL Benefit	4,640	0
NOL Carryforward Adjustment for Expired NOLs	84	0
Stock Compensation Plan Adjustments	272	0
Change in state apportionment rate	(350)	(406)
Change in valuation allowance	(3,868)	8,869
Research and development credit	546	(136)
Other	31	(63)
Income tax expense	$ 103	$ 0

Effective Income Tax Rate Reconciliation, Operating Loss Carryforwards, Adjustment to NOL Benefit

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Effective Income Tax Rate Reconciliation, Operating Loss Carryforwards, Expired, Amount

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Effective Income Tax Rate Reconciliation, Transaction Costs

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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