Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current State and Local Tax Expense (Benefit)	$ (269)	$ 445	$ (809)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount	1,777	1,688	1,059
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Research and Development, Amount	0	0	(978)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(20,418)	(35,276)	25,928
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	(12,300)	26,065	(25,315)
Write-off of tax credits	31,053
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	157	1,064	115
Income Tax Benefit	$ 0	$ (6,014)	$ 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	21.00%