Stockholders' Equity - Common and Preferred Shares (Tables)

6 Months Ended

Jun. 30, 2014

Equity [Abstract]

Fair Value Measurements on Recurring and Nonrecurring Basis

The Series A Warrants and Series B Warrants granted were valued using the Black-Scholes valuation model and the following Level 3 input assumptions:

Weighted Average Assumptions
	April 2013 Private Placement Series A Warrants			April 2013 Private Placement Series B Warrants
Risk-free interest rate		0.24	%		0.24	%
Expected life (years)		2.3			1.9
Expected volatility		87	%		87	%
Dividend yield		0.00	%		0.00	%

The Series B Preferred Stock was valued using Level 2 inputs by reference to the market value of the Company’s common stock into which the Series B Preferred Stock is convertible. The warrants granted were valued using the Black-Scholes valuation model and the following Level 3 input assumptions:

Weighted Average Assumptions
	September 2013
	Private Placement Warrants
Risk-free interest rate		0.24	%
Expected life (years)		1.9
Expected volatility		79	%
Dividend yield		0.00	%

Summary of the Company's Outstanding Common Stock Warrants

The following is a summary of the Company’s outstanding common stock warrants as of June 30, 2014 and December 31, 2013:

				Number of Warrants outstanding as of:
	Date of	Exercise		(In thousands)
Warrants Issued in Connection with:	Issuance	Price		June 30, 2014		December 31, 2013
Direct Registration Series I Warrants	07/20/09	$	504.00		12		12
Private Placement Series A Warrants	04/16/13	$	3.40		1,460		1,460
Private Placement Series B Warrants	04/16/13	$	3.40		757		1,107
2013 Private Placement Warrants	09/23/13	$	2.24		—		2,452
2013 Private Placement Warrants	09/23/13	$	2.80		147		147
2014 Public Offering Warrants	02/18/14	$	2.75		1,872		—
2014 Public Offering Warrants	02/18/14	$	2.56		293		—
2014 Private Placement Warrants	05/28/14	$	2.90		2,700		—
2014 Private Placement Warrants	05/28/14	$	3.70		216		—
Total Warrants Outstanding					7,457		5,178

Summary of the Company's Stock Option Activity under its 2005 Plan

The following is a summary of the Company’s stock option activity under its 2005 Plan for the six months ended June 30, 2014:

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
	(In thousands)					(Years)		(In thousands)
Options outstanding at December 31, 2013		192		$	12.54		7.61
Granted		438		$	2.77
Forfeited and expired		(15	)	$	4.45
Options outstanding at June 30, 2014		615		$	5.79		8.58	$	—
Options exercisable at June 30, 2014		207		$	10.51		6.49	$	—
Options vested or expected to vest at June 30, 2014		513		$	6.26		8.37	$	—

Weighted-Average Assumptions

The fair values for the stock options granted were estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the six months ended June 30, 2014:

Weighted Average Assumptions
Risk-free interest rate	1.56	%
Expected life (years)	4
Expected volatility	101	%
Dividend yield	0.00	%