Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Summary of Assets Measured at Fair Value on a Recurring Basis

The following table summarizes our investments fair value using the above input categories (in thousands):

	Level 1		Level 2		Total
Cash equivalents:
Money market funds	$	4,485	$	-	$	4,485
Commercial paper		-		5,999		5,999
Corporate debt securities		-		1,457		1,457
Municipal bonds		-		4,971		4,971
Total cash equivalents		4,485		12,427		16,912
Investments:
Commercial paper		-		26,482		26,482
Corporate debt securities		-		34,387		34,387
Municipal bonds		-		3,783		3,783
Total investments		-		64,652		64,652
Total assets measured at fair value	$	4,485	$	77,079	$	81,564

Carrying Value and Estimated Fair Value of Revolving Credit Note, Promissory Notes Payable and Term Loan Payable

The carrying value and estimated fair value of our convertible notes, revolving credit agreement and term loans are as follows (in thousands):

	June 30, 2015				December 31, 2014
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Convertible notes	$	79,923	$	113,034	$	-	$	-
Revolving credit agreement		-		-		11,000		11,000
Term loans		-		-		10,458		10,458