CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net loss	$ (32,003)	$ (11,710)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,504	2,165
Share-based compensation	12,807	2,869
Other	178	21
Changes in operating assets and liabilities:
Accounts receivable	1,857	1,032
Prepaid expenses and other current assets	2,617	823
Other assets and liabilities	(490)	(348)
Accounts payable	(535)	404
Accrued liabilities	872	874
Accrued compensation and related benefits	3,426	777
Deferred revenue	9,647	5,945
Net cash used in operating activities	(5,088)	(162)
Cash flows from investing activities
Purchases of property and equipment	(13,097)	(3,979)
Internal-use software and website development costs	(3,915)	(2,344)
Purchases of marketable securities	(6,464)	(12,409)
Proceeds from maturities of marketable securities	6,250
Cash paid for the acquisition of Zopim, net of cash acquired	(1,896)
Net cash used in investing activities	(19,122)	(18,732)
Cash flows from financing activities
Proceeds from initial public offering, net of issuance costs	104,377
Proceeds from exercise of employee stock options	3,372	233
Proceeds from issuance of debt	3,940
Principal payments on debt	(20,000)
Taxes paid related to net share settlement of equity awards	(969)
Principal payments on capital lease obligations	(179)	(166)
Net cash provided by financing activities	90,541	67
Effect of exchange rate changes on cash and cash equivalents	(2)	17
Net increase (decrease) in cash and cash equivalents	66,329	(18,810)
Cash and cash equivalents at the beginning of period	53,725	48,688
Cash and cash equivalents at the end of period	120,054	29,878
Supplemental cash flow data:
Cash paid for interest and income taxes	660	56
Non-cash investing and financing activities:
Issuance of common stock for the acquisition of Zopim	10,893
Purchases of property and equipment in accounts payable and accrued expenses	5,001	45
Property and equipment acquired through tenant improvement allowances	3,554
Share-based compensation capitalized in internal-use software development costs	1,125	85
IPO costs in accounts payable	1,145
Vesting of early exercised stock options	$ 810	$ 612