Stockholders' Equity

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Stockholders' Equity

NOTE 4 — STOCKHOLDERS’ EQUITY

Common Stock Warrant Valuation

The Company accounts for its common stock warrants under guidance in ASC 815 that clarifies the determination of whether an instrument (or an embedded feature) is indexed to an entity’s own stock, which would qualify for classification as liabilities. The guidance requires the Company’s outstanding warrants to be classified as liabilities and to be fair valued at each reporting period, with the changes in fair value recognized as other income (expense) in the Company’s consolidated statements of operations.

At both March 31, 2016 and December 31, 2015 the Company had warrants outstanding to purchase 8.3 million shares of common stock, having an initial exercise price of $10.86 per share, which warrants were issued by the Company in the February 2015 offering. The exercise price was adjusted to $3.62 on January 21, 2016 pursuant to the terms of warrant. The fair value of these warrants on March 31, 2016 and December 31, 2015 was determined using a Black-Scholes model with the following key level 3 inputs:

	March 31, 2016			December 31, 2015
Risk-free interest rate		1.21	%		1.76	%
Expected life (in years)		3.89			4.14
Dividend yield		—			—
Volatility		110	%		112	%
Stock price	$	0.46		$	0.48

During three months ended March 31, 2016, the change in fair value of $0.3 million of noncash income related to the February 2015 warrants was recorded as other income (expense) in the Company’s consolidated statement of operations.

On March 16, 2016, warrants outstanding, which were initially issued by the Company in an underwritten public offering in March 2011, to purchase 3.8 million shares of common stock expired and the fair value of the warrants of $38,000 of noncash income was reversed as other income (expense) in the Company’s consolidated statement of operations. At December 31, 2015, the Company also had March 2011 warrants outstanding to purchase 3.8 million shares of common stock, respectively, having an exercise price of $2.46 per share. The fair value of these warrants on December 31, 2015 was determined using a Black Scholes valuation model with the following key level 3 inputs:

	December 31, 2015
Risk-free interest rate		0.16	%
Expected life (in years)		0.21
Dividend yield		—
Volatility		179	%
Stock price	$	0.48

The following table sets forth the Company’s financial liabilities, related to warrants issued in the February 2015 and March 2011 offerings, subject to fair value measurements as of March 31, 2016 and December 31, 2015:

	Fair Value as of March 31, 2016		Basis of Fair Value Measurements
(in thousands)			Level 1		Level 2		Level 3
February 2015 warrants	$	1,494	$	—	$	—	$	1,494

	Fair Value as of December 31, 2015		Basis of Fair Value Measurements
(in thousands)			Level 1		Level 2		Level 3
March 2011 warrants		38		—		—		38
February 2015 warrants		1,826		—		—		1,826
Total common stock warrants	$	1,864	$	—	$	—	$	1,864

The following table is a reconciliation of the warrant liability measured at fair value using level 3 inputs (in thousands):

	Warrant Liability
Balance at December 31, 2015	$	1,864
Change in fair value of common stock warrants during three months ended March 31, 2016		(370	)
Balance at March 31, 2016	$	1,494