CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 547,850	$ 272,201
Short-term marketable securities	273,366	207,332
Accounts receivable (net of allowance for doubtful accounts of $7,352 and $4,992 at December 31, 2017 and December 31, 2016, respectively)	76,173	68,725
Prepaid expenses and other current assets	15,700	12,921
Total current assets	913,089	561,179
Long-term marketable securities	25,032	0
Property, equipment and software, net	103,651	92,440
Goodwill	107,954	170,667
Intangibles, net	16,893	32,611
Restricted cash	18,554	17,317
Other non-current assets	31,339	10,992
Total assets	1,216,512	885,206
Current liabilities:
Accounts payable- trade	4,568	2,003
Accounts payable- merchant share	4,465	18,352
Accrued liabilities	73,665	36,730
Deferred revenue	3,469	3,314
Total current liabilities	86,167	60,399
Long-term liabilities	30,737	17,621
Total liabilities	116,904	78,020
Commitments and contingencies (Note 12)
Stockholders’ equity:
Common stock, $0.000001 par value — 200,000,000 and 200,000,000 shares authorized, 83,724,916 and 79,429,833 shares issued and outstanding at December 31, 2017 and December 31, 2016, respectively	0	0
Additional paid-in capital	1,038,017	892,983
Treasury stock	(46)	0
Accumulated other comprehensive loss	(8,444)	(15,576)
Retained earnings (accumulated deficit)	70,081	(70,221)
Total stockholders’ equity	1,099,608	807,186
Total liabilities and stockholders’ equity	$ 1,216,512	$ 885,206