Income Taxes Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Deferred Tax Assets and Liabilities

At December 31, 2017 and 2016, the estimated deferred income tax assets and liability were comprised of the following:

	12/31/2017			12/31/2016
	(in thousands)
Deferred tax assets:
Net operating loss carryforwards	$	40,502		$	57,327
Stock—based compensation	2,097			2,863
Development costs	27,213			26,805
Other	1,396			1,939
Net deferred tax assets	71,208			88,934
Valuation allowance	(71,208		)	(88,934		)
Deferred tax assets, net	$	—		$	—

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,
	2017		2016		2015
Tax provision at federal statutory tax rate	35.0	%	35.0	%	35.0	%
New York State income taxes, net	—	%	—	%	(0.1	)%
Non-deductible interest	—	%	(0.3	)%	(1.2	)%
Permanent items	(3.1	)%	(3.5	)%	(2.5	)%
Change in valuation allowance	(31.9	)%	(31.2	)%	(31.4	)%
Effective tax rate	—	%	—	%	(0.2	)%