Fair Value (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Assets Measured at Fair Value on Recurring Basis

The following are the major categories of assets measured at fair value on a recurring basis as of December 31, 2014 and 2013, using quoted prices in active markets for identical assets (Level 1); significant other observable inputs (Level 2); and significant unobservable inputs (Level 3):

	December 31, 2014
	(In thousands)
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total December 31, 2014
Assets measured at fair value
Cash and Cash Equivalents	$	34,766	$	—	$	—	$	34,766
Restricted Cash		250		—		—		250
Total Assets measured at fair value	$	35,016	$	—	$	—	$	35,016

	December 31, 2013
	(In thousands)
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total December 31, 2013
Assets measured at fair value
Cash and Cash Equivalents	$	10,014	$	—	$	—	$	10,014
Restricted Cash		375		—		—		375
Short-term investments		—	$	6,191		—	$	6,191
Total Assets measured at fair value	$	10,389	$	6,191	$	—	$	16,580

Fair Value, Inputs, Level 3 [Member]

Summary of Preferred Stock Warrant Liability

The change in the fair value of the Level 3 preferred stock warrant liability is summarized below:

	December 31, 2013
	(In thousands)
Fair value at beginning of year	$	109
Issuances		—
Change in fair value recorded in other expense		1,800
Reclassification to additional paid-in capital upon the Merger		(1,909	)
Fair value at end of year	$	—