Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 116,499	$ 97,196
Accounts receivable, net	218,235	133,267
Marketable securities, prepaid expenses, and other current assets	30,973	7,514
TOTAL CURRENT ASSETS	365,707	237,977
Property and equipment, net	25,403	15,196
Internal use software development costs, net	13,929	11,501
Goodwill	65,705	16,290
Intangible assets, net	50,783	14,090
Marketable securities and other assets, non-current	15,209	1,427
TOTAL ASSETS	536,736	296,481
Current liabilities:
Accounts payable and accrued expenses	247,967	151,021
Debt and capital lease obligations, current portion	0	105
Other current liabilities	2,196	3,276
TOTAL CURRENT LIABILITIES	250,163	154,402
Other liabilities, non-current	2,247	1,272
Deferred tax liability, net	6,225	607
Contingent consideration liabilities	0	11,448
TOTAL LIABILITIES	$ 258,635	$ 167,729
Commitments and contingencies (Note 17)
STOCKHOLDERS’ EQUITY
Preferred stock, $0.00001 par value, 10,000 shares authorized at December 31, 2015 and December 31, 2014; 0 shares issued and outstanding at December 31, 2015 and December 31, 2014	$ 0	$ 0
Common stock, $0.00001 par value; 500,000 shares authorized at December 31, 2015 and December 31, 2014; 46,600 and 37,192 shares issued and outstanding at December 31, 2015 and December 31, 2014, respectively	0	0
Additional paid-in capital	358,406	209,472
Accumulated other comprehensive loss	(15)	(8)
Accumulated deficit	(80,290)	(80,712)
TOTAL STOCKHOLDERS’ EQUITY	278,101	128,752
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 536,736	$ 296,481