Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 64,950	$ 76,320
Accounts receivable, net	60,021	59,288
Prepaid expenses and other current assets	3,541	2,499
Total current assets	128,512	138,107
Long-term assets:
Property and equipment, net	3,222	3,194
Intangible assets, net	4,926	1,307
Goodwill	9,658	6,320
Deferred tax assets	332	332
Other assets	938	1,168
Total long-term assets	19,076	12,321
Total assets	147,588	150,428
Current liabilities:
Accounts payable and accrued expenses	61,171	59,419
Deferred rent, short-term	838	808
Contingent consideration on acquisition	1,443	0
Deferred income	31	674
Other current liabilities	748	53
Total current liabilities	64,231	60,954
Long-term liabilities:
Deferred rent	5,990	5,260
Deferred tax liabilities	1,385	338
Other non-current liabilities	98	737
Total liabilities	71,704	67,289
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.0001 par value: 250,000,000 shares authorized as of June 30, 2018 and December 31, 2017, respectively; 56,259,264 and 55,136,038 shares issued and 52,413,768 and 51,290,542 outstanding as of June 30, 2018 and December 31, 2017, respectively	5	5
Treasury stock, at cost: 3,845,496 shares as of June 30, 2018 and December 31, 2017	(8,443)	(8,443)
Additional paid-in capital	290,516	288,277
Accumulated other comprehensive loss	(504)	(232)
Accumulated deficit	(205,690)	(196,468)
Total stockholders’ equity	75,884	83,139
Total liabilities and stockholders’ equity	$ 147,588	$ 150,428