Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes [Abstract]

Reconciliation of unrecognized tax benefits

	Amount
Unrecognized tax benefits balance at December 31, 2011	$	45
Increases related to current and prior year tax positions		—
Settlements and lapses in statutes of limitations		—
Unrecognized tax benefits balance at December 31, 2012	$	45

Significant components of deferred tax assets

	December 31,
	2012			2011
Deferred tax assets:
Net operating loss carryforwards	$	—		$	—
Research and development credits		—			—
Capitalized research and development and other		21,193			11,156
Total deferred tax assets		21,193			11,156
Net deferred tax assets		21,193			11,156
Valuation allowance for deferred tax assets		(21,193	)		(11,156	)
Net deferred taxes	$	—		$	—

Provision for income taxes

	December 31,
	2012			2011
Income tax benefit at statutory federal rate	$	(2,708	)	$	(4,042	)
State tax expense (benefit), net of federal		(445	)		(664	)
Fair Value of Derivative		(1,221	)		—
Expired tax attributes		3,008			3,709
Removal of net operating losses and research and development credits		(2,522	)		2,644
Stock compensation expense		—			22
Change in valuation allowance		10,037			167
Other		(6,149	)		(1,836	)
Provision for income taxes	$	—		$	—