CONSOLIDATED AND CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net loss	$ (46,470)	$ (51,401)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	14,144	8,891
Equity based compensation	14,234	5,528
Other non-cash adjustments	749	119
Changes in operating assets and liabilities:
Accounts receivable	(1,199)	1,040
Inventories	(1,548)	(4,840)
Prepaid expenses and other current assets	(19,533)	(13,203)
Accounts payable and accrued expenses	2,438	(3,306)
Deferred revenue and other liabilities	30,583	19,487
Other assets	(147)	(2,086)
Net cash used in operating activities	(6,749)	(39,771)
Cash flows from investing activities
Purchase of short-term and long-term investments	(108,311)	(65,000)
Sale and maturities of short-term investments	37,000	50,002
Purchase of property and equipment	(25,204)	(24,331)
Site and software development costs	(8,426)	(6,148)
Other investing activities, net	302	(3,012)
Net cash used in investing activities	(104,639)	(48,489)
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(7,837)
Net proceeds from exercise of stock options	272
Proceeds from issuance of Series B convertible redeemable preferred units		154,774
Repurchase of common units		(23,500)
Dividends paid to Series A convertible redeemable preferred		(15,000)
Repurchase of employee equity		(5,528)
Net cash (used in) provided by financing activities	(7,565)	110,746
Effect of exchange rate changes on cash and cash equivalents	(332)	6
Net (decrease) increase in cash and cash equivalents	(119,285)	22,492
Cash and cash equivalents
Beginning of period	355,859	65,289
End of period	236,574	87,781
Supplemental disclosure of non-cash investing activities
Purchase of property and equipment included in accounts payable and accrued expenses and in other liabilities	6,312	5,787
Construction costs capitalized under finance lease obligations	$ 165
Supplemental disclosure of non-cash financing activities
Accretion of preferred unit dividends		$ 11,755