Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

Fair Value Measurements

	September 30, 2014 (in thousands)
		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Money market funds (cash equivalents)	$	11,913	$	—	$	—	$	11,913
Corporate notes and bonds		—		13,827		—		13,827
Asset-backed securities		—		254		—		254
Total assets measured at fair value	$	11,913	$	14,081	$	—	$	25,994

	December 31, 2013 (in thousands)
		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Money market funds (cash equivalents)	$	27,096	$	—	$	—	$	27,096
Corporate notes and bonds		—		11,460		—		11,460
Asset-backed securities		—		500		—		500
Total assets measured at fair value	$	27,096	$	11,960	$	—	$	39,056