Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 70,567	$ 76,320
Accounts receivable, net	67,963	59,288
Prepaid expenses and other current assets	3,502	2,499
Total current assets	142,032	138,107
Long-term assets:
Property and equipment, net	3,009	3,194
Intangible assets, net	4,654	1,307
Goodwill	9,619	6,320
Deferred tax assets	332	332
Other assets	2,029	1,168
Total long-term assets	19,643	12,321
Total assets	161,675	150,428
Current liabilities:
Accounts payable and accrued expenses	75,398	59,419
Deferred rent, short-term	777	808
Contingent consideration on acquisition	1,443	0
Deferred income	4	674
Other current liabilities	771	53
Total current liabilities	78,393	60,954
Long-term liabilities:
Deferred rent	5,947	5,260
Deferred tax liabilities	1,393	338
Other non-current liabilities	132	737
Total liabilities	85,865	67,289
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.0001 par value: 250,000,000 shares authorized as of September 30, 2018 and December 31, 2017, respectively; 56,813,104 and 55,136,038 shares issued and 52,967,608 and 51,290,542 outstanding as of September 30, 2018 and December 31, 2017, respectively	5	5
Treasury stock, at cost: 3,845,496 shares as of September 30, 2018 and December 31, 2017	(8,443)	(8,443)
Additional paid-in capital	292,166	288,277
Accumulated other comprehensive loss	(649)	(232)
Accumulated deficit	(207,269)	(196,468)
Total stockholders’ equity	75,810	83,139
Total liabilities and stockholders’ equity	$ 161,675	$ 150,428