Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 149,367	$ 149,423
Marketable securities	38,604	40,550
Accounts receivable, net	133,575	192,064
Prepaid expenses and other current assets	11,516	9,540
TOTAL CURRENT ASSETS	333,062	391,577
Property and equipment, net	33,208	36,246
Internal use software development costs, net	14,929	16,522
Other assets, non-current	2,129	2,921
Intangible assets, net	5,219	6,804
Goodwill	65,705	65,705
TOTAL ASSETS	454,252	519,775
Current liabilities:
Accounts payable and accrued expenses	158,837	214,903
Other current liabilities	3,156	3,534
TOTAL CURRENT LIABILITIES	161,993	218,437
Deferred tax liability, net	42	42
Other liabilities, non-current	1,678	1,783
TOTAL LIABILITIES	163,713	220,262
Commitments and contingencies (Note 9)
STOCKHOLDERS' EQUITY
Preferred stock, $0.00001 par value, 10,000 shares authorized at March 31, 2017 and December 31, 2016; 0 shares issued and outstanding at March 31, 2017 and December 31, 2016	0	0
Common stock, $0.00001 par value; 500,000 shares authorized at March 31, 2017 and December 31, 2016; 49,547 and 49,378 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	0	0
Additional paid-in capital	405,560	398,787
Accumulated other comprehensive loss	(180)	(273)
Accumulated deficit	(114,841)	(99,001)
TOTAL STOCKHOLDERS' EQUITY	290,539	299,513
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 454,252	$ 519,775