Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2013

Balance Sheet Components

Schedule of cash and cash equivalents

  Cash and cash equivalents consist of the following:

	December 31,
					June 30, 2013
	2011		2012
	(in thousands)
					(unaudited)
Cash	$	3,759	$	1,776	$	4,406
Cash equivalents
Money market funds		63,616		42,446		117,451
Certificate of deposit		25		25		25
		63,641		42,471		117,476
Total	$	67,400	$	44,247	$	121,882

Schedule of property and equipment, net

  Property and equipment, net consists of the following:

	December 31,
							June 30, 2013
	2011			2012
	(in thousands)
							(unaudited)
Computer equipment	$	549		$	4,385		$	7,173
Software		795			788			1,130
Office furniture		343			803			1,168
Leasehold improvements		459			986			2,451
Construction in progress		—			542			2,352
Total property and equipment		2,146			7,504			14,274
Less accumulated depreciation		(696	)		(1,887	)		(3,356	)
Property and equipment, net	$	1,450		$	5,617		$	10,918

Schedule of accrued expenses and other current liabilities

       Accrued expenses and other current liabilities are as follows:

	December 31,
					June 30, 2013
	2011		2012
	(in thousands)
					(unaudited)
Accrued bonuses, commissions and wages	$	1,715	$	4,737	$	6,022
Accrued vacation		936		1,502		1,958
Liability payable for unvested stock options exercises		271		523		777
Accrued legal, consulting and audit fees		343		282		664
Liability for employee stock purchase plan		—		—		506
Accrued sales taxes		348		543		485
Accrued marketing expenses		199		395		1,251
Accrued other		654		963		1,389
Total	$	4,466	$	8,945	$	13,052

Schedule of changes in accumulated other comprehensive income

 Changes in accumulated other comprehensive income are as follows:

	Foreign Currency Items		Total
	(in thousands, unaudited)
Beginning balance at January 1, 2013	$	145	$	145
Other comprehensive income before reclassfications		12		12
Amounts reclassified from accumulated other comprehensive income		—		—
Ending balance at June 30, 2013 (unaudited)	$	157	$	157