Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net loss	$ (23,973)	$ (58,944)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,939	2,695
Non-cash interest expense	106	518
Change in fair value of preferred stock warrant liabilities	0	42,559
Unrealized foreign exchange (gain) loss	(37)	258
Charges related to the issuance of common stock warrants to a distributor	0	2,500
Stock-based compensation expense	8,297	2,959
Withdrawn secondary offering expense	0	555
Non-cash charitable contribution of common stock	0	193
Deferred income taxes	(652)	0
Changes in operating assets and liabilities, net of effects from acquisition:
Accounts receivable	(10,058)	(2,197)
Deferred commissions	(572)	(546)
Prepaid expenses and other assets	(3,408)	(1,532)
Accounts payable	1,656	349
Accrued expenses	1,124	1,779
Deferred revenue	15,743	6,085
Other liabilities	3,042	(271)
Net cash used in operating activities	(3,793)	(3,040)
Cash flows from investing activities:
Purchases of property and equipment	(347)	(848)
Capitalized software costs	(3,662)	(2,217)
Purchase of available-for-sale securities	0	(34,079)
Proceeds from maturities of available-for-sale securities	0	17,000
Cash paid for acquisition, net of cash acquired	(12,428)	0
Net cash used in investing activities	(16,437)	(20,144)
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriting discounts and commissions	0	90,539
Payments of initial public offering costs	0	(3,436)
Payments of withdrawn secondary offering costs	0	(555)
Proceeds from issuance of preferred stock upon warrant exercises	0	3,163
Proceeds from issuance of debt	0	669
Repayment of debt	(1,250)	(9,151)
Principal payments under capital lease obligations	(1,396)	(1,159)
Proceeds from stock option and warrant exercises	1,983	615
Payment of withholding tax on net exercise of stock-based awards	0	(48)
Net cash (used in) provided by financing activities	(663)	80,637
Effect of exchange rate changes on cash and cash equivalents	(24)	(145)
Net (decrease) increase in cash and cash equivalents	(20,917)	57,308
Cash and cash equivalents at beginning of period	85,409	7,067
Cash and cash equivalents at end of period	64,492	64,375
Supplemental cash flow information:
Cash paid for interest	257	475
Cash paid for income taxes	84	18
Non-cash investing and financing activities:
Conversion of convertible preferred stock to common stock	0	132,775
Assets acquired under capital leases and other financing arrangements	2,833	1,223
Common stock issued for business acquisition	335	0
Capitalized assets financed by accounts payable	844	0
Capitalized stock-based compensation	$ 380	$ 165