Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Schedule of fair value of the financial assets and liabilities



			Fair Value Measurements at
			September 30, 2013
			(unaudited)
					Significant
	Total Carrying		Quoted Prices		Other		Significant
	Value at		in Active		Observable		Unobservable
	September 30,		Markets		Inputs		Inputs
	2013		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	22,945	$	19,948	$	2,997	$	—
Marketable securities		64,293		—		64,293		—
Long term investments		15,215		—		15,215		—
Marketable securities - restricted (Other Assets)		305		—		305		—
Total assets at fair value	$	102,758	$	19,948	$	82,810	$	—
Liabilities:
Derivative liabilities	$	22,213	$	—	$	—	$	22,213



			Fair Value Measurements at
			December 31, 2012
					Significant
	Total Carrying		Quoted Prices		Other		Significant
	Value at		in Active		Observable		Unobservable
	December 31,		Markets		Inputs		Inputs
	2012		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	40,302	$	31,561	$	8,741	$	—
Marketable securities		48,206		—		48,206		—
Marketable securities - restricted (Other Assets)		279		—		279		—
Total assets at fair value	$	88,787	$	31,561	$	57,226	$	—
Liabilities:
Derivative liabilities	$	251	$	—	$	—	$	251

Schedule of Level 3 liabilities included in Non-current Liabilities on the Balance Sheet



	Nine Months ended
	September 30, 2013
	(unaudited)

Balance at December 31, 2012	$	251
Initial value of interest make-whole payment
associated with the convertible notes		9,270
Changes in fair value of derivative liabilities included in earnings		12,692

Balance at September 30, 2013	$	22,213

Schedule of unrestricted marketable securities



At September 30, 2013:
Available for Sale	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Corporate debt securities	$	79,588	$	13	$	(93)	$	79,508



At December 31, 2012:
Available for Sale	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Corporate debt securities	$	48,259	$	1	$	(54)	$	48,206

Warrants To Purchase Common Stock [Member]

Schedule of assumptions used to calculate fair value liabilities



Exercise Price	$4 - $5 per share
Volatility	65%
Stock Price as of September 30, 2013	$7.33 per share
Term	7.3 - 8.3 years
Dividend Yield	0.0%
Risk-Free Rate	2.2% - 2.4%

Interest Make-Whole Liability [Member]

Schedule of assumptions used to calculate fair value liabilities



Volatility	45%
Stock Price as of September 30, 2013	$7.33 per share
Credit Spread	1299 bps
Term	4 years
Dividend Yield	0.0%

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring and/or nonrecurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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