Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Schedule of Effective Income Tax Rate Reconciliation

Income tax benefit for the years ended December 31, 2014, 2013 and 2012 differed from amounts computed by applying the applicable U.S. federal corporate income tax rate of 34% to loss before income taxes as a result of the following:



	2014			2013			2012
Computed statutory income tax benefit	$	(29,144	)	$	(13,909	)	$	(27,837	)
Increase in income tax benefit resulting from State income tax benefit, net of federal income taxes	(3,544		)	(1,834		)	(3,711		)
Nondeductible stock based compensation	1,386			575			333
Contribution of services by shareholder	677			527			527
Gain in previously held equity investment	—			(2,477		)	—
Research and development tax credits	258			(1,203		)	—
Other, net	1,503			1,317			(238		)
	(28,864		)	(17,004		)	(30,926		)
Change in valuation allowance for deferred tax assets	28,761			17,004			30,926
Total income tax provision	$	(103	)	$	—		$	—

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that comprise the deferred tax assets and liabilities at December 31, 2014 and 2013, are as follows:



	2014		2013
Deferred tax assets
Allowance for doubtful accounts	$	783	$	—
Equity securities	4,694		415
Property, plant and equipment	79		—
Accrued liabilities and long-term debt	2,703		1,445
Stock-based compensation	8,283		1,677
Deferred revenue	43,774		28,456
Research and development tax credits	9,661		10,062
Net operating loss carryforwards	103,114		97,395
Total deferred tax assets	173,091		139,450
Less: Valuation allowance	161,660		131,985
Net deferred tax assets	11,431		7,465
Deferred tax liabilities
Property, plant and equipment	—		140
Intangible assets	11,431		7,325
Total deferred tax liabilities	11,431		7,465
Net deferred tax assets (liabilities)	$	—	$	—

Summary of Valuation Allowance

Activity within the valuation allowance for deferred tax assets during the years ended December 31, 2014, 2013 and 2012 was as follows:



	2014		2013		2012
Valuation allowance at beginning of year	$	131,985	$	113,051	$	82,125
Increase in valuation allowance as a result of
Mergers and acquisitions, net	914		1,930		—
Current year operations	28,761		17,004		30,926
Valuation allowance at end of year	$	161,660	$	131,985	$	113,051