Income Taxes - Schedule of Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Federal
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 10,706	$ 48,531
Disallowed interest expense (no expiration)	11,802	17,783
Contributions (expiring through 2025)	0	658
Research tax credits (expiring through 2040)	0	1,342
State | New Jersey (expiring in 2039)
Operating Loss Carryforwards [Line Items]
Net operating losses	0	4,942
State | Other states (expiring through 2039)
Operating Loss Carryforwards [Line Items]
Net operating losses	0	3,266
State | New Jersey research credits (expiring in 2039)
Operating Loss Carryforwards [Line Items]
Net operating losses	0	764
Foreign
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 0	$ 0