Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net loss	$ (12,947)	$ (3,753)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Stock-based compensation expense	3,772	1,657
Bad debt expense	576	489
Depreciation and amortization	3,946	941
Amortization of deferred financing fees		7
Unrealized foreign currency loss	89	253
Release of restricted cash	20
Changes in assets and liabilities, net of acquired balances:
Accounts receivable	28,477	4,456
Prepaid expenses and other current assets	458	276
Other assets	142	46
Accounts payable and accrued expenses	1,605	643
Accrued cost of revenue	(22,896)	(4,893)
Accrued payroll and payroll related expenses	(2,100)	(2,233)
Other long-term liabilities	(47)	35
Deferred revenue	22	98
Net cash and cash equivalents used in operating activities	1,117	(1,978)
Cash flows from investing activities
Purchases of property and equipment	(2,858)	(1,840)
Net cash and cash equivalents used in investing activities	(2,858)	(1,840)
Cash flows from financing activities
Proceeds from exercises of stock options	1,036	202
Withholdings for vesting of restricted stock units	(457)	(261)
Net cash and cash equivalents provided by financing activities	579	(59)
Effect of exchange rates on cash and cash equivalents	(36)	(66)
Net (decrease) increase in cash and cash equivalents	(1,198)	(3,943)
Cash and cash equivalents, beginning of the period	99,237	137,439
Cash and cash equivalents, end of the period	98,039	133,496
Supplemental disclosure of noncash investing and financing activities
Purchases of property and equipment with tenant improvement allowance	$ 128