Income Taxes Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Deferred Tax Assets and Liabilities

At December 31, 2018 and 2017, the estimated deferred income tax assets and liability were comprised of the following:

	12/31/2018			12/31/2017
	(in thousands)
Deferred tax assets:
Net operating loss carryforwards	$87,181			$40,502
Stock—based compensation	1,911			2,097
Development costs	619			27,213
Deferred interest	11,494			—
Deferred compensation	590			68
Depreciation	5,604			376
Other	907			952
	108,306			71,208
Deferred tax liability:
Depreciation	(2,037		)	—
Net deferred tax assets	106,269			71,208
Valuation allowance	(106,378		)	(71,208		)
Deferred tax liability, net	$	(109	)	$	—

Schedule of Effective Income Tax Rate Reconciliation

The following is a reconciliation of the federal statutory tax rate to the Company’s effective tax rate:

	Year ended December 31,
	2018		2017		2016
Tax provision at federal statutory tax rate	21.0	%	35.0	%	35.0	%
Non-deductible interest	—	%	—	%	(0.3	)%
Permanent items	(0.3	)%	(3.1	)%	(3.5	)%
Tax reform	(0.1	)%	—	%	—	%
Change in valuation allowance	(20.7	)%	(31.9	)%	(31.2	)%
Effective tax rate	(0.1	)%	—	%	—	%