Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Company's Financial Assets and Liability Measured at Fair Value on a Recurring Basis

The following fair value hierarchy table presents information about each major category of the Company’s financial assets and liability measured at fair value on a recurring basis as of June 30, 2013 and December 31, 2012:

	Fair value measurement using
	Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
Balance at June 30, 2013
Liabilities
Warrant liability	$	—	$	—	$	653	$	653

	Fair value measurement using
	Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
Balance at December 31, 2012
Liabilities
Warrant liability	$	—	$	—	$	374	$	374

Reconciliation of Warrant Liability Measured at Fair Value on Recurring Basis

The reconciliation of warrant liability measured at fair value on a recurring basis using unobservable inputs (Level 3) is as follows:

	Warrant
	Liability
Balance at December 31, 2012	$	374
Exercise of warrants		(38	)
Change in fair value of warrant liability		317
Balance at June 30, 2013	$	653