Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Measurements

Schedule of the assets and liabilities measured at fair value on a recurring basis

	Balance at
	December 31,
	2012		Level 1		Level 2		Level 3
Liabilities
Warrants to purchase preferred stock(1)	$	1,103	$	—	$	—	$	1,103
Total warrants to purchase preferred stock	$	1,103	$	—	$	—	$	1,103

(1) The Company used an option pricing model to determine the fair value of the warrants to purchase preferred stock.  Significant inputs included an estimate of the fair value of the Company’s preferred stock as of December 31, 2012, the remaining contractual life of the warrant, a risk-free rate of interest, and an estimate of the Company’s stock volatility using the volatilities of guideline peer companies.  In connection with the Company’s IPO, these warrants to purchase preferred stock were adjusted to fair value through July 2, 2013 and were subsequently reclassified to additional paid-in capital (refer to note 8).

Schedule of changes in the Company's Level 3 instruments measured at fair value on a recurring basis

	Warrants to Purchase Preferred Stock
	2013			2012
	(unaudited)
Beginning balance at July 1,	$	926		$	1,113
Mark-to-market income before reclassifications	(136		)	(5		)
Reclassification to additional paid-in capital	(790		)	—
Ending balance at September 30,	$	—		$	1,108

	Warrants to Purchase Preferred Stock
	2013			2012
	(unaudited)
Beginning balance at January 1,	$	1,103		$	1,127
Mark-to-market income before reclassifications	(313		)	(19		)
Reclassification to additional paid-in capital	(790		)	—
Ending balance at September 30,	$	—		$	1,108

	Contingent
	Consideration on
	Acquisition(1)
	2012
	(unaudited)
Beginning balance at January 1,	$	817
Mark-to-market expense before reclassifications	46
Settlement of contingent consideration	(863		)
Ending balance at September 30,	$	—

(1) On February 11, 2011, the Company acquired all of the outstanding equity of Transpera. The purchase price included contingent consideration consisting of up to 169,131 shares of the Company’s common stock payable on the one year anniversary of the closing of the acquisition based on certain performance criteria being achieved. In arriving at the value of the contingent consideration, the Company used a valuation model based on future expectations combined with management’s judgment. In the then-absence of a public trading market, the Company exercised judgment and considered numerous objective and subjective factors to determine the fair value of the Company’s common stock.