CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 106,174	$ 134,947
Short-term investments	69,172	25,000
Accounts receivable, net of allowance for doubtful accounts of $1,338 and $833 at December 31, 2016 and 2015, respectively	71,945	63,239
Prepaid expenses and other current assets	6,293	5,297
Total current assets	253,584	228,483
Property and equipment, net	16,376	25,128
Intangible assets, net	47,987	14,880
Goodwill	43,895	43,895
Other assets	914	8,685
Total assets	362,756	321,071
Current liabilities:
Accounts payable	4,968	8,187
Accrued compensation and benefits	13,202	15,237
Other current liabilities	20,864	20,170
Deferred revenues	6,856	7,342
Total current liabilities	45,890	50,936
Other non-current liabilities	78	5
Deferred rent	2,285	701
Contingent consideration related to acquisitions	185	1,407
Deferred tax liabilities	2,569	2,532
Total liabilities	51,007	55,581
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $0.00001 par value —10,000,000 shares authorized and no shares issued or outstanding at December 31, 2016 and 2015
Common stock, $0.00001 par value—250,000,000 shares authorized and 98,208,117 shares issued and 88,560,409 outstanding at December 31, 2016; 250,000,000 shares authorized and 89,935,381 shares issued and 81,995,286 outstanding at December 31, 2015	1	1
Additional paid-in capital	647,474	570,588
Treasury stock, at cost	(96,574)	(85,427)
Accumulated other comprehensive income (loss)	(748)	(747)
Accumulated deficit	(238,404)	(218,925)
Total stockholders’ equity	311,749	265,490
Total liabilities and stockholders’ equity	$ 362,756	$ 321,071