Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 136,567	$ 116,499
Accounts receivable, net	159,268	218,235
Marketable securities, prepaid expenses, and other current assets	29,193	30,973
TOTAL CURRENT ASSETS	325,028	365,707
Property and equipment, net	24,308	25,403
Internal use software development costs, net	14,731	13,929
Goodwill	65,705	65,705
Intangible assets, net	46,726	50,783
Marketable securities and other assets, non-current	10,451	15,209
TOTAL ASSETS	486,949	536,736
Current liabilities:
Accounts payable and accrued expenses	185,399	247,967
Other current liabilities	1,844	2,196
TOTAL CURRENT LIABILITIES	187,243	250,163
Other liabilities, non-current	2,047	2,247
Deferred tax liability, net	1,868	6,225
TOTAL LIABILITIES	$ 191,158	$ 258,635
Commitments and contingencies (Note 8)
STOCKHOLDERS’ EQUITY
Preferred stock, $0.00001 par value, 10,000 shares authorized at March 31, 2016 and December 31, 2015; 0 shares issued and outstanding at March 31, 2016 and December 31, 2015	$ 0	$ 0
Common stock, $0.00001 par value; 500,000 shares authorized at March 31, 2016 and December 31, 2015; 48,033 and 46,600 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively	0	0
Additional paid-in capital	373,721	358,406
Accumulated other comprehensive income (loss)	76	(15)
Accumulated deficit	(78,006)	(80,290)
TOTAL STOCKHOLDERS’ EQUITY	295,791	278,101
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 486,949	$ 536,736