Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Taxes

Schedule of components of the income tax expense/(benefit)

The components of the income tax expense/ (benefit) for the years ended December 31, 2015, 2014, and 2013 were as follow, in thousands:

	Year Ended December 31,
	2015		2014		2013
Current
Federal	$	914	$	—	$	—
State		42		—		—
Deferred
Federal		—		—		—
State		—		—		—
Total	$	956	$	—	$	—

Schedule of reconciliation of the expected income tax benefit computed using the federal statutory income tax rate to the entity's effective income tax rate

A reconciliation of the expected income tax expense/(benefit) computed using the U.S. Federal statutory income tax rate to the Company's effective income tax rate is as follows, in thousands:

	Year Ended December 31,
	2015			2014			2013
Income tax expense/(benefit) computed at U.S. Federal statutory tax rate	$	5,240		$	6,955		$	(32,286	)
Permanent items		601			610			340
State income taxes		50			627			(4,772	)
Change in valuation allowance		(4,849	)		(10,604	)		31,526
Uncertain income tax position		833			(960	)		5,411
Research and development credits		(979	)		(535	)		(156	)
Other		60			(125	)		(63	)
Deferred rate change		—			4,032			—
Income tax expense (benefit)	$	956		$	—		$	—

Schedule of Significant components of the entity's deferred tax assets (liabilities)

The significant components of the Company's deferred income tax assets (liabilities) were as follow, in thousands:

	As of December 31,
	2015			2014
Deferred tax assets:
Net operating loss carryforward	$	34,676		$	42,800
Deferred rent credit		532			506
Accrued compensation and non-qualified stock options		5,891			3,392
Deferred financing costs		188			244
Depreciation and amortization		291			474
Research and development credits		5,529			4,725
Capitalized overhead into inventory (UNICAP §263A)		543			675
Other		495			552
Valuation allowance		(47,526	)		(49,914	)
Net deferred tax asset		619			3,454
Deferred tax liability:
Debt discount on convertible notes		(509	)		(3,454	)
Depreciation		(110	)		—
Net deferred taxes	$	—		$	—

Schedule of reconciliation of the beginning and ending amount of gross unrecognized tax benefits

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows, in thousands:

	Year Ended December 31,
	2015			2014			2013
Balance as of January 1	$	8,342		$	9,828		$	688
Gross (decreases) increases related to prior-year tax positions		(5	)		(1,040	)		23
Gross increases related to current-year tax positions		984			80			9,117
Gross decreases related to current-year tax positions		(244	)		—			—
Change in tax rates		(21	)		(526	)		—
Balance as of December 31	$	9,056		$	8,342		$	9,828