DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Tables)

6 Months Ended

Jun. 30, 2013

DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Assets and liabilities measured at fair value on a recurring basis

Determining which category an asset or liability falls within the hierarchy requires significant judgment. The Company evaluates its hierarchy disclosures each quarter. Assets and liabilities measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012 are summarized as follows:

(In thousands)
Assets	Level 1			Level 2			Level 3			June 30, 2013
Fair value of cash equivalents		$	69,142		$	0		$	0		$	69,142
Restricted cash			0			213			0			213
Total		$	69,142		$	213		$	0		$	69,355
Liabilities
Fair value of common stock warrants		$	0		$	0		$	13,468		$	13,468
Total		$	0		$	0		$	13,468		$	13,468
Assets	Level 1			Level 2			Level 3			December 31, 2012
Fair value of cash equivalents		$	35,069		$	0		$	0		$	35,069
Restricted cash			0			163			0			163
Short-term investments			22,096			0			0			22,096
Total		$	57,165		$	163		$	0		$	57,328
Liabilities
Fair value of common stock warrants		$	0		$	0		$	16,405		$	16,405
Total		$	0		$	0		$	16,405		$	16,405

Potentially dilutive securities

Net loss per share is calculated by dividing net loss by the weighted-average shares of common stock outstanding during the period. Diluted net income per share is calculated by dividing net income by the weighted-average shares of common stock outstanding and potential shares of common stock during the period. For all periods presented, potentially dilutive securities are excluded from the computation of fully diluted net loss per share as their effect is anti-dilutive. Potentially dilutive securities include:

	For the six months ended
(In thousands)	June 30, 2013		May 31, 2012
Warrants to purchase common stock		2,213		5,188
Options to purchase common stock		8,336		6,095
Total potentially dilutive securities		10,549		11,283