Cash and Cash Equivalents, Short-term Investments and Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Cash and Cash Equivalents [Abstract]

Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]

Cash and cash equivalents consist of the following significant investment asset classes, with disclosure of amortized cost, gross unrealized gains and losses, and fair value as of December 31, 2013 and December 31, 2012 (in thousands):

	December 31, 2013
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash / Cash Equivalents		Security Classification
Cash	$	38,823	$	—	$	—	$	38,823	$	38,823	N/A
Money market funds	65,708		—		—		65,708		65,708		Available for sale
Total cash and cash equivalents	$	104,531	$	—	$	—	$	104,531	$	104,531

	December 31, 2012
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash / Cash Equivalents		Security Classification
Cash	$	23,422	$	—	$	—	$	23,422	$	23,422	N/A
Money market funds	38,892		—		1		38,891		38,891		Available for sale
Total cash and cash equivalents	$	62,314	$	—	$	1	$	62,313	$	62,313

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

The following table displays the financial assets measured at fair value, on a recurring basis, with money market funds recorded within cash and cash equivalents (in thousands):

	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
At December 31, 2013	$	—
Money market funds	$	65,708	$	—	$	—	$	65,708
Total	$	65,708	$	—	$	—	$	65,708
At December 31, 2012
Money market funds	$	38,891	$	—	$	—	$	38,891
Total	$	38,891	$	—	$	—	$	38,891