Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at December 31, 2015:

	December 31, 2015		Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
Money market funds	$	19,257	$	19,257	$	—	$	—
Corporate debt securities	$	12,786	$	12,786	$	—	$	—
U.S. Treasury, government and agency debt securities	$	23,946	$	23,946	$	—	$	—

The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at December 31, 2014:

	December 31, 2014		Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
Money market funds	$	55,963	$	55,963	$	—	$	—
Contingent consideration liability	$	11,448	$	—	$	—	$	11,448

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

The Company’s contingent consideration liabilities were recorded at fair value and were determined to be Level 3 fair value items. The changes in the fair value of the contingent consideration liabilities are summarized below:

	Year Ended
	December 31, 2015			December 31, 2014		December 31, 2013
	(in thousands)
Beginning balance	$	11,448		$	—	$	—
Increase to contingent consideration liability related to the iSocket acquisition (See Note 7)	—			11,382		—
Increase to contingent consideration liability related to the Chango acquisition (See Note 7)	16,171			—		—
Change in fair value of contingent consideration liabilities recorded in general and administrative expense	306			66		—
Decrease in iSocket contingent consideration liability related to goodwill adjustment (See Note 7)	(2,317		)	—		—
Issuance of shares associated with iSocket and Chango contingent consideration	(25,608		)	—		—
Ending balance	$	—		$	11,448	$	—

The Company’s pre-IPO preferred stock warrants were recorded at fair value and were determined to be Level 3 fair value items. The changes in the fair value of preferred stock warrants are summarized below:

	Year Ended
	December 31, 2015		December 31, 2014			December 31, 2013
	(in thousands)
Beginning balance	$	—	$	5,451		$	1,330
Change in value of preferred stock warrants recorded in other expense, net	—		732			4,121
Net exercise of preferred stock warrant and conversion of preferred stock warrant to common stock warrant	—		(6,183		)	—
Ending balance	$	—	$	—		$	5,451

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques

The Company determined the fair value of the convertible preferred stock warrants utilizing the Black-Scholes model with the following weighted-average assumptions:

	Series B December 31,  2013			Series C December 31, 2013
Risk-free interest rate	0.18		%	0.13		%
Expected term (in years)	0.69			0.50
Estimated dividend yield	2.00		%	2.00		%
Weighted-average estimated volatility	64		%	63		%
Fair value (in thousands)	$	173		$	5,278