Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net loss	$ (16,893)	$ (10,242)	$ (12,452)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	8,587	5,867	4,666
Stock-based compensation	6,387	6,401	5,843
Deferred income taxes		62	(3,600)
Change in fair value of warrants			(28)
Provision for reserves on accounts receivable	118	449	137
Amortization of premium on investments	1	73	133
Amortization of deferred financing costs			44
Loss on disposal of equipment	86	43	83
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	409	(3,247)	(4,437)
Prepaid expenses	(543)	(963)	77
Other current assets	344	319	347
Other assets	1,140	(819)	90
Accounts payable	(2,324)	2,117	(1,321)
Accrued expenses	(1,902)	2,473	3,732
Deferred revenue	6,075	4,785	5,477
Net cash provided by (used in) operating activities	1,485	7,318	(1,209)
Investing activities
Cash paid for acquisition, net of cash acquired	(9,100)		(27,210)
Purchases of investments			(14,063)
Maturities of investments	3,060	8,200	2,596
Purchases of property and equipment	(3,518)	(3,415)	(6,299)
Capitalization of internal-use software costs	(1,034)	(500)	(24)
Decrease (increase) in restricted cash	121	(19)
Net cash (used in) provided by investing activities	(10,471)	4,266	(45,000)
Financing activities
Proceeds from issuance of common stock in connection with initial public offering, net of offering costs			56,763
Proceeds from exercise of stock options	597	1,830	1,346
Purchase of non-controlling interest in consolidated subsidiary		(1,084)
Payments under term loan			(7,000)
Payments under capital lease obligation	(1,399)
Net cash (used in) provided by financing activities	(802)	746	51,109
Effect of exchange rate changes on cash	(343)	(991)	(419)
Net (decrease) increase in cash and cash equivalents	(10,131)	11,339	4,481
Cash and cash equivalents at beginning of year	33,047	21,708	17,227
Cash and cash equivalents at end of year	22,916	33,047	21,708
Supplemental disclosure of cash flow information
Cash paid for income taxes	184	122	61
Cash paid for interest	96		303
Supplemental disclosure of non-cash investing and financing activities
Unpaid internal-use software costs	6	565
Unpaid purchases of property and equipment	559	152	46
Conversion of preferred stock to common stock			121,124
Conversion of warrants to purchase preferred stock to warrants to purchase common stock			395
Accretion of Series A, B, C and D redeemable convertible preferred stock issuance costs and dividends			772
Vesting of restricted stock		8	101
Supplemental disclosure of cash flow related to acquisitions In connection with the acquisitions of Unicorn and Zencoder on January 31, 2014 and on August 14, 2012, respectively, the following transactions occurred:
Fair value of assets acquired	44,373		31,183
Liabilities assumed related to acquisition	(4,645)		(3,804)
Total purchase price	39,728		27,379
Less fair value of common stock issued in connection with acquisition	(30,615)
Add working capital adjustment receivable			79
Less cash and cash equivalents acquired	(13)		(248)
Cash paid for acquisition, net of cash acquired	$ 9,100		$ 27,210