Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Components of Income Tax Provision

The components of income tax provision were as follows at December 31:

	2015			2014		2013
	(in thousands)
Current:
U.S. federal	$	(12	)	$	546	$	30
U.S. state and local taxes	172			224		58
Total current	160			770		88
Deferred:
U.S. federal	(28,378		)	1,512		(35,672		)
U.S. state and local taxes	(5,322		)	1,017		(1,877		)
Foreign	—			63		(63		)
Total deferred	(33,700		)	2,592		(37,612		)
Total income tax (benefit) expense	$	(33,540	)	$	3,362	$	(37,524	)

Reconciliation of Income Tax at U.S. Statutory Rate to Effective Income Tax Rate

A reconciliation of income tax computed at the U.S. statutory rate to the effective income tax rate is as follows at December 31:

	2015		2014		2013
Statutory federal income tax rate	35.0	%	35.0	%	35.0	%
State tax expense, net of federal benefit	2.3	%	6.3	%	3.7	%
Tax credits	2.1	%	—	%	—	%
Other nondeductible expenses	-0.2	%	9.2	%	3.4	%
Effect of change in income tax rates	0.1	%	-2.2	%	-1.9	%
Impact of state net operating losses	—	%	23.2	%	5.4	%
Stock options	-0.2	%	—	%	0.1	%
Other	1.5	%	-1.9	%	—	%
Expired net operating losses	-1.4	%	—	%	15.7	%
Change in valuation allowance	0.5	%	-12.2	%	-283.0	%
Total expense	39.7	%	57.4	%	-221.6	%

Summary of Components of Deferred Tax Assets and Liabilities

The following is a summary of the components of our deferred tax assets and liabilities at December 31:

	2015			2014
Deferred tax assets:
Net operating losses and credit carryforwards	$	64,881		$	41,447
Stock options	12,394			8,133
Deferred rent	2,887			2,536
Deferred revenue	—			1
Accrued expenses	8,486			9,362
Tax credits	2,338			—
Other	7			—
Total deferred tax assets	90,993			61,479
Valuation allowance	(127		)	(512		)
Net deferred tax assets	$	90,866		$	60,967
Deferred tax liabilities:
Property, equipment, and intangibles	$	(12,826	)	$	(16,620	)
Other	(677		)	(610		)
Total deferred tax liabilities	(13,503		)	(17,230		)
Net deferred tax assets	$	77,363		$	43,737

Reconciliation of the Accrual Balances for Unrecognized Tax Benefits

Reconciliations of the beginning and ending accrual balances for unrecognized tax benefits are as follows:

	2015		2014	2013
	(in thousands)
Balance at beginning of the year	393		393	393
Additions for tax positions taken in current period	178		—	—
Reductions as a result of lapse of statute of limitations	(108	)	—	—
Balance at end of year	463		393	393