Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 149,423	$ 116,499
Marketable Securities	40,550	23,249
Accounts receivable, net	192,064	218,235
Prepaid expenses and other current assets	9,540	7,724
TOTAL CURRENT ASSETS	391,577	365,707
Marketable securities, non-current	0	13,483
Property and equipment, net	36,246	25,403
Internal use software development costs, net	16,522	13,929
Other assets, non-current	2,921	1,726
Intangible assets, net	6,804	50,783
Goodwill	65,705	65,705
TOTAL ASSETS	519,775	536,736
Current liabilities:
Accounts payable and accrued expenses	214,903	247,967
Other current liabilities	3,534	2,196
TOTAL CURRENT LIABILITIES	218,437	250,163
Deferred tax liability, net	1,783	2,247
Deferred tax liability, net	42	6,225
TOTAL LIABILITIES	220,262	258,635
Commitments and contingencies (Note 18)
STOCKHOLDERS' EQUITY
Preferred stock, $0.00001 par value, 10,000 shares authorized at December 31, 2016 and December 31, 2015; 0 shares issued and outstanding at December 31, 2016 and December 31, 2015	0	0
Common stock, $0.00001 par value; 500,000 shares authorized at December 31, 2016 and December 31, 2015; 49,378 and 46,600 shares issued and outstanding at December 31, 2016 and December 31, 2015, respectively	0	0
Additional paid-in capital	398,787	358,406
Accumulated other comprehensive loss	(273)	(15)
Accumulated deficit	(99,001)	(80,290)
TOTAL STOCKHOLDERS' EQUITY	299,513	278,101
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 519,775	$ 536,736