Fair Value Measurements

3 Months Ended

Mar. 31, 2014

Fair Value Measurements [Abstract]

Fair Value Measurements

8. Fair Value Measurements

Assets and liabilities recorded at fair value on the balance sheets are categorized based upon the level of judgment associated with the inputs used to measure the fair value.  Level inputs are as follows:

Level 1 – quoted prices in active markets for identical assets or liabilities.

Level 2 – other significant observable inputs for the assets or liabilities through corroboration with market data at the measurement date.

Level 3 – significant unobservable inputs that reflect management’s best estimate of what market participants would use to price the assets or liabilities at the measurement date.

The following table summarizes fair value measurements by level at March 31, 2014 for assets and liabilities measured at fair value on a recurring basis:

(In thousands)	Level I		Level II		Level III			Total
Cash equivalents	$	57,238	$	—	$	—		$	57,238
Short-term investments		50,585		—		—			50,585
Warrant liabilities		—		—		(9,479	)		(9,479	)

The following table summarizes fair value measurements by level at December 31, 2013 for assets and liabilities measured at fair value on a recurring basis:

(In thousands)	Level I		Level II		Level III			Total
Cash equivalents	$	10,281	$	—	$	—		$	10,281
Short-term investments		27,085		—		—			27,085
Warrant liabilities		—		—		(24,182	)		(24,182	)

Liabilities measured at market value on a recurring basis include warrant liabilities resulting from the Company’s July 2009 and August 2011 equity financings. In accordance with ASC 815-40, the warrant liabilities are marked to market each quarter-end until they are completely settled. The warrants are valued using the Black-Scholes method, using assumptions consistent with the Company’s application of ASC 505-50. The change in the fair value of the liabilities classified in Level III is due to the unrealized gain of $14.7 million recognized and the gain is presented in the Condensed Statement of Operations. See Warrant Liabilities above.

The Company considers carrying amounts of accounts receivable, accounts payable and accrued expenses to approximate fair value due to the short-term nature of these financial instruments.

The Company’s non-financial assets are measured at fair value when there is an indicator of impairment and recorded at fair value only when an impairment charge is recognized.  The Company’s non-financial assets were not material at March 31, 2014 or 2013.