Proofpoint (PFPT) 10-Q 12 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Entity Registrant Name	'PROOFPOINT INC.	'
Entity Central Index Key	'0001212458	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	35,906,978

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$51,828	$39,254
Short-term investments	19,760	47,263
Accounts receivable, net of allowance for doubtful accounts of $249 and $187 at September 30, 2013 and December 31, 2012, respectively	21,881	18,115
Inventory	429	567
Deferred product costs, current	928	1,184
Prepaid expenses and other current assets	3,838	3,491
Total current assets	98,664	109,874
Property and equipment, net	10,545	8,560
Deferred product costs, noncurrent	272	326
Goodwill	39,206	18,557
Intangible assets, net	13,348	2,913
Other noncurrent assets	3,848	211
Total assets	165,883	140,441
Current liabilities	'	'
Accounts payable	4,468	2,496
Accrued liabilities	15,960	12,078
Notes payable and lease obligations, current	1,667	1,658
Deferred rent	445	462
Deferred revenue, current	75,053	62,642
Total current liabilities	97,593	79,336
Notes payable and lease obligations, noncurrent	1,110	2,354
Other long term liabilities, noncurrent	3,062	726
Deferred revenue, noncurrent	26,275	24,217
Total liabilities	128,040	106,633
Stockholders’ equity	'	'
Common stock, $0.0001 par value; 200,000 shares authorized at September 30, 2013 and December 31, 2012; 35,786 and 33,044 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	4	3
Additional paid-in capital	235,965	216,280
Accumulated other comprehensive (loss) income	-1	3
Accumulated deficit	-198,125	-182,478
Total stockholders’ equity	37,843	33,808
Total liabilities and stockholders’ equity	$165,883	$140,441

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets Parenthetical (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified
Allowance for doubtful accounts receivable, current	$249	$187
Number of shares of common stock reserved for future issuance	'	'
Par value of common stock (USD per share)	$0.00	$0.00
Common stock authorized (in shares)	200,000	200,000
Common stock issued (in shares)	35,786	33,044
Common stock outstanding (in shares)	35,786	33,044

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Revenue:	'		'		'		'
Subscription	$33,464		$25,991		$92,732		$74,010
Hardware and services	1,039		1,093		4,362		3,636
Total revenue	34,503		27,084		97,094		77,646
Cost of revenue:	'		'		'		'
Subscription	8,937		6,967		25,042		21,414
Hardware and services	1,409		1,163		3,851		3,466
Total cost of revenue	10,346	[1],[2]	8,130	[1],[2]	28,893	[1],[2]	24,880	[1],[2]
Gross profit	24,157		18,954		68,201		52,766
Operating expense:	'		'		'		'
Research and development	8,307		6,262		23,460		18,367
Sales and marketing	17,415		14,126		49,782		39,751
General and administrative	5,758		3,141		13,437		8,871
Total operating expense	31,480	[1],[2]	23,529	[1],[2]	86,679	[1],[2]	66,989	[1],[2]
Operating loss	-7,323		-4,575		-18,478		-14,223
Interest expense, net	-11		-7		-4		-110
Other income (expense), net	352		109		-163		-100
Loss before (provision for) benefit from income taxes	-6,982		-4,473		-18,645		-14,433
(Provision for) benefit from income taxes	-207		-119		2,998		-430
Net loss	-7,189		-4,592		-15,647		-14,863
Net loss per share, basic and diluted	($0.20)		($0.14)		($0.45)		($0.70)
Weighted average shares outstanding, basic and diluted (in shares)	35,436		31,844		34,502		21,258
Stock-based compensation expense	2,379		1,947		6,602		5,383
Cost of subscription revenue [Member]	'		'		'		'
Operating expense:	'		'		'		'
Stock-based compensation expense	203		205		631		443
Intangible amortization expense	568		333		1,307		2,452
Cost of hardware and services revenue [Member]	'		'		'		'
Operating expense:	'		'		'		'
Stock-based compensation expense	45		20		120		46
Research and development [Member]	'		'		'		'
Operating expense:	'		'		'		'
Stock-based compensation expense	502		502		1,566		1,409
Intangible amortization expense	8		8		24		23
Sales and marketing [Member]	'		'		'		'
Operating expense:	'		'		'		'
Stock-based compensation expense	881		830		2,502		2,301
Intangible amortization expense	321		72		619		389
General and administrative [Member]	'		'		'		'
Operating expense:	'		'		'		'
Stock-based compensation expense	748		390		1,783		1,184
Intangible amortization expense	$12		$0		$23		$0
[1]	Includes stock‑based compensation expense as follows: Three Months Ended September 30, Nine Months Ended September 30, 2013 2012 2013 2012Cost of subscription revenue203 205 631 443Cost of hardware and services revenue45 20 120 46Research and development502 502 1,566 1,409Sales and marketing881 830 2,502 2,301General and administrative748 390 1,783 1,184
[2]	Includes intangible amortization expense as follows:Three Months Ended September 30, Nine Months Ended September 30, 2013 2012 2013 2012Cost of subscription revenue568 333 1,307 2,452Research and development8 8 24 23Sales and marketing321 72 619 389General and administrative12 — 23 —

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net loss	($7,189)	($4,592)	($15,647)	($14,863)
Other comprehensive income, net of tax	'	'	'	'
Unrealized gains (losses) on investments, net	9	22	-4	13
Comprehensive loss	($7,180)	($4,570)	($15,651)	($14,850)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities	'	'
Net loss	($15,647)	($14,863)
Adjustments to reconcile net loss to net cash provided by operating activities	'	'
Depreciation and amortization	6,123	6,037
Accretion of investments	490	0
Provision for allowance for doubtful accounts	26	0
Stock‑based compensation	6,602	5,383
Change in fair value of contingent earn-out liability	6	0
Changes in assets and liabilities, net of effect of acquisitions:	'	'
Accounts receivable	-2,902	-1,292
Inventory	138	-169
Deferred product costs	310	1,121
Prepaid expenses and other current assets	-114	-1,133
Noncurrent assets	-3,580	54
Accounts payable	897	1,099
Accrued liabilities	733	2,778
Deferred rent	-257	321
Deferred revenue	14,469	2,596
Net cash provided by operating activities	7,294	1,932
Cash flows from investing activities	'	'
Proceeds from sale and maturity of short-term investments	47,386	3,151
Purchase of short-term investments	-20,376	-49,316
Purchase of property and equipment	-4,502	-3,884
Acquisitions of businesses, net of cash acquired	-28,509	0
Net cash used in investing activities	-6,001	-50,049
Cash flows from financing activities	'	'
Proceeds from issuance of common stock, net of repurchases	12,954	2,106
Proceeds from initial public offering, net of offering costs	0	68,329
Repayments of equipment financing loans	-1,673	-557
Net cash provided by financing activities	11,281	69,878
Net increase in cash and cash equivalents	12,574	21,761
Cash and cash equivalents	'	'
Beginning of period	39,254	9,767
End of period	51,828	31,528
Supplemental disclosure of noncash investing and financing information	'	'
Unpaid initial public offering costs	0	34
Unpaid purchase of property and equipment	$1,838	$439

The_Company_and_Summary_of_Sig

The Company and Summary of Significant Accounting Policies (Notes)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
The Company and Summary of Significant Accounting Policies	'
	The Company and Summary of Significant Accounting Policies
	The Company
	Proofpoint, Inc. (the “Company”) was incorporated in Delaware in June 2002 and is headquartered in California.
	Proofpoint is a pioneering security-as-a-service ("SaaS") vendor that enables large and mid-sized organizations worldwide to defend, protect, archive and govern their most sensitive data. The Company’s SaaS platform is comprised of a number of data protection solutions, including threat protection, regulatory compliance, archiving and governance, and secure communication.
	Basis of Presentation and Consolidation
	The accompanying unaudited Condensed Consolidated Financial Statements and condensed footnotes have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary (consisting only of normal recurring adjustments) for a fair statement of results for the interim periods presented have been included. The results of operations for the three and nine months ended September 30, 2013 and 2012 are not necessarily indicative of the results to be expected for the year ended December 31, 2013 or for other interim periods or for future years.
	The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated on consolidation. The accompanying Condensed Consolidated Balance Sheet as of December 31, 2012 is derived from audited financial statements as of that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These accompanying Condensed Consolidated Financial Statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's 2012 Annual Report on Form 10-K.
	There have been no material changes to the Company's significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2012 except as otherwise described below.
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates and such difference may be material to the financial statements.
	Business Combinations
	The accompanying Condensed Consolidated Financial Statements include the operations of each acquired businesses after the completion of the acquisitions. The Company accounts for acquired businesses using the acquisition method of accounting which requires, among other things, that assets acquired and liabilities assumed be recognized at their estimated fair values as of the acquisition date, while transaction costs are expensed as incurred. The measurement of fair value of assets and liabilities assumed requires significant judgment. Any excess of the purchase price over the fair value of the net assets acquired is recorded as goodwill.
	Goodwill and Intangible Assets
	Goodwill represents the excess of the purchase price of the acquired enterprise over the fair value of identifiable assets acquired and liabilities assumed. The Company applies Accounting Standards Codification ("ASC") 350, “Intangibles—Goodwill and Other”, and performs an annual goodwill impairment test during the fourth quarter of the Company’s fiscal year and more frequently if an event or circumstance indicates that an impairment may have occurred. For the purposes of impairment testing, the Company has determined that it has one reporting unit. A two-step impairment test of goodwill is required pursuant to ASC 350-20-35. In the first step, the Company conducts an assessment of qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines that it is more likely than not that the fair value of its reporting unit is less than its carrying amount, it then conducts the second step, a two-part test for impairment of goodwill. The Company first compares the fair value of its reporting unit to its carrying value. If the fair value exceeds the carrying value of the net assets, goodwill is not considered impaired and no further analysis is required. If the carrying value of the net assets exceeds the fair values of the reporting unit, then the second part of the impairment test must be performed in order to determine the implied fair value of the goodwill. The implied fair value of goodwill is calculated by deducting the fair value of all tangible and intangible net assets of the reporting unit, excluding goodwill, from the fair value of the reporting unit as determined in the first step. If the carrying value of the goodwill exceeds the implied fair value, then an impairment loss equal to the difference would be recorded. The identification and measurement of goodwill impairment involves the estimation of the fair value of the Company. The estimate of fair value of the Company, based on the best information available as of the date of the assessment, is subjective and requires judgment, including management assumptions about expected future revenue forecasts and discount rates. No impairment to the carrying value of goodwill was identified to date by the Company during the nine months ended September 30, 2013.
	Intangible assets consist of developed technology, customer relationships, vendor relationships, non-compete arrangements and trademarks and patents. The values assigned to intangibles are based on estimates and judgments regarding expectations for success and life cycle of solutions and technologies acquired.
	Intangible assets are amortized on a straight-line basis over their estimated lives, which approximate the pattern in which the economic benefits of the intangible assets are consumed, typically ranging from one to seven years.
	Revenue Recognition
	The Company derives its revenue primarily from two sources: (1) subscription revenue for rights related to the use of the SaaS platform and (2) hardware, training and professional services revenue provided to customers related to their use of the platform. Subscription revenue is derived from a subscription‑based enterprise licensing model with contract terms typically ranging from one to three years, and consist of (i) subscription fees from the licensing of the SaaS platform, (ii) subscription fees for access to the on-demand elements of the platform and (iii) subscription fees for the right to access the Company’s customer support services.
	The Company applies the provision of ASC 985-605, “Software Revenue Recognition", and related interpretations, to all transactions involving the licensing of software, as well as related support, training, and other professional services. ASC 985-605 requires revenue earned on software arrangements involving multiple elements such as software license, support, training and other professional services to be allocated to each element based on the relative fair values of these elements. The fair value of an element must be based on vendor‑specific objective evidence (“VSOE”) of fair value. VSOE of fair value of each element is based on the price charged when the element is sold separately. Revenue is recognized when all of the following criteria are met as set forth in ASC 985-605:
	•	Persuasive evidence of an arrangement exists,
	•	Delivery has occurred,
	•	The fee is fixed or determinable, and
	•	Collectability is probable.
	The Company has analyzed all of the elements included in its multiple element arrangements and has determined that it does not have sufficient VSOE of fair value to allocate revenue to its subscription and software license agreements, support, training, and professional services. The Company defers all revenue under the software arrangement until the commencement of the subscription services and any associated professional services. Once the subscription services and the associated professional services have commenced, the entire fee from the arrangement is recognized ratably over the remaining period of the arrangement. If the professional services are essential to the functionality of the subscription, then the revenue recognition does not commence until such services are completed.
	In the accompanying Condensed Consolidated Statement of Operations, revenue is categorized as "subscription" and "hardware and services." Although the Company is unable to separate its multiple elements under the applicable revenue recognition guidance since it does not have sufficient VSOE of fair value for revenue recognition purposes, the Company has used a systematic and rational estimate to classify revenue between "subscription" and "hardware and services." For presentation purposes only, the Company allocates revenue to hardware and services based upon management's best estimate of fair value of such deliverables using a cost plus model. The remaining consideration of the arrangement is then allocated to subscription services. Management believes that this methodology provides a reasonable basis to allocate revenue between subscription and hardware and services for presentation purposes.
	The hosted on-demand service agreements do not provide customers with the right to take possession of the software supporting the hosted service. The Company recognizes revenue from its hosted on-demand services in accordance with ASC 605-20, and as such recognizes revenue when the following criteria are met:
	•	Persuasive evidence of an arrangement exists,
	•	Delivery of the Company’s obligations to its customers has occurred,
	•	Collection of the fees is probable, and
	•	The amount of fees to be paid by the customer is fixed or determinable.
	In October 2009, the FASB amended the accounting guidance for multiple element arrangements (“ASU 2009-13”) to:
	•	Provide updated guidance on whether multiple deliverables exist, how the deliverables in an arrangement should be separated, and how the arrangement consideration should be allocated among its elements;
	•	Require an entity to allocate revenue in an arrangement that has separate units of accounting using best estimated selling price (“BESP”) of deliverables if a vendor does not have VSOE of fair value or third-party evidence of selling price (“TPE”), and
	•	Eliminate the use of the residual method and require an entity to allocate revenue using the relative selling price method to the separate unit of accounting.
	Concurrently, the FASB amended the accounting guidance for revenue recognition (“ASU 2009-14”) to exclude hardware appliances containing software components and hardware components that function together to deliver the hardware appliance’s essential functionality from the scope of the software revenue recognition guidance of ASC 985-605.
	The Company elected to adopt this new guidance in the first quarter of fiscal 2011 for new and materially modified revenue arrangements originating after January 1, 2011.
	Prior to the adoption of ASU 2009-14, revenue derived from hardware appliance sales were recognized based on the software revenue recognition guidance. The Company could not establish VSOE of fair value for the undelivered elements in the arrangement, and therefore the entire fee from the arrangement was recognized ratably over the contractual term of the agreement. In addition, the Company was unable to establish VSOE of fair value of its hosted on-demand service agreements, and therefore the entire fee for the agreement was recognized ratably over the contractual term of the agreement.
	As a result of the adoption of this accounting guidance, revenue derived from subscription services and hardware appliance sales are no longer subject to industry‑specific software revenue recognition guidance. For all arrangements within the scope of these new accounting pronouncements, including the Company’s hosted on-demand services, the Company evaluates each element in a multiple element arrangement to determine whether it represents a separate unit of accounting. An element constitutes a separate unit of accounting when the delivered item has standalone value and delivery of the undelivered element is probable and within the Company’s control. Revenue derived from the licensing of the SaaS platform continues to be accounted for in accordance with the industry specific revenue recognition guidance.
	Hardware appliance revenue is recognized upon shipment. Subscription and support revenue are recognized over the contract period commencing on the start date of the contract. Professional services and training, when sold with hardware appliances or subscription and support services, are accounted for separately when those services have standalone value. In determining whether professional services and training services can be accounted for separately from subscription and support services, the Company considers the following factors: availability of the services from other vendors, the nature of the services, and the dependence of the subscription services on the customer’s decision to buy the professional services. If professional services and training do not qualify for separate accounting, the Company recognizes the professional services and training ratably over the contract term of the subscription services.
	Delivery generally occurs when the hardware appliance is delivered to a common carrier freight on board shipping point by the Company or the hosted service has been activated and communicated to the customer accordingly. The Company’s fees are typically considered to be fixed or determinable at the inception of an arrangement and are negotiated at the outset of an arrangement, generally based on specific products and quantities to be delivered. In the event payment terms are provided that differ significantly from the Company's standard business practices, the fees are deemed to not be fixed or determinable and revenue is recognized as the fees become paid.
	The Company assesses collectability based on a number of factors, including credit worthiness of the customer and past transaction history of the customer. Through September 30, 2013, the Company experienced no significant credit losses.
	Deferred Revenue
	Deferred revenue primarily consists of billings or payments received in advance of revenue recognition from the sale of the Company’s subscription fees, training and professional services. Once the revenue recognition criteria are met, this revenue is recognized ratably over the term of the associated contract, which typically ranges from 12 to 36 months.
	Fair Value of Financial Instruments
	The carrying amounts of certain of the Company’s cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to their short maturities. Based on borrowing rates that are available to the Company for loans with similar terms and consideration of the Company’s credit risk, the carrying value of the note payable approximates its fair value and is a Level 2 measurement within the fair value hierarchy. The Company has an Acquisition-related contingent earn-out liability that requires Level 3 classification because there are no active markets or observable inputs.
	Comprehensive Loss
	Comprehensive loss includes all changes in equity that are not the result of transactions with stockholders. The Company’s comprehensive loss consists of its net loss and changes in unrealized gains (losses) from its available-for-sale investments. Total comprehensive loss has been presented in the accompanying Condensed Consolidated Statements of Comprehensive Loss.
	During the nine months ended September 30, 2013, the Company adopted Accounting Standards Update ("ASU") 2013-02, "Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income", which requires filers to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net loss. The Company had no significant reclassifications out of accumulated other comprehensive loss into net loss for the three and nine months ended September 30, 2013 and 2012.
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU 2013-11, "Income Taxes", a new accounting standard update on the financial statement presentation of unrecognized tax benefits. The new guidance provides that a liability related to an unrecognized tax benefit would be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The new guidance becomes effective for the Company on January 1, 2014 and it should be applied prospectively to unrecognized tax benefits that exist at the effective date with retrospective application permitted. The Company is currently assessing the impact of this new guidance.

Acquisitions_Notes

Acquisitions (Notes)	9 Months Ended
	Sep. 30, 2013
Acquisitions [Abstract]	'
Acquisitions	'
	Acquisitions
	In 2013, the Company entered into agreements to acquire several companies (collectively, the "Acquisitions"). Each acquisition was accounted for under the acquisition method of accounting in which the tangible and identifiable intangible assets and liabilities of each acquired company was recorded at their respective fair values as of each acquisition date, including an amount for goodwill representing the difference between the respective acquisition consideration and fair values of identifiable net assets. The Company expects the combined entities to achieve savings in corporate overhead costs and opportunities for growth through expanded geographic and customer segment diversity with the ability to leverage additional products and capabilities. These factors, among others, contributed to a purchase price in excess of the estimated fair value of each acquired company's net identifiable assets acquired and, as a result, goodwill was recorded in connection with each acquisition. Goodwill is not deductible for tax purposes.
	Armorize Technologies, Inc.
	On September 5, 2013 (the "Armorize Acquisition Date"), pursuant to the terms of an Agreement and Plan of Merger, a wholly-owned subsidiary of the Company merged with and into Armorize Technologies, Inc. ("Armorize"), with Armorize surviving as a wholly-owned subsidiary of the Company. Based in Taiwan, Armorize develops and markets leading cloud-based SaaS anti-malware products and will add real-time dynamic detection of next generation threats and malware to the Company's existing capabilities.
	At September 30, 2013, the Company completed the valuation of the estimated fair values of the acquired tangible and identifiable intangible assets and liabilities assumed at the Armorize Acquisition Date, and the results of operations and the fair values of the acquired assets and liabilities assumed have been included in the accompanying Condensed Consolidated Financial Statements since the Armorize Acquisition Date. The Company recorded $183 in revenue from Armorize for the nine months ended September 30, 2013.
	At the Armorize Acquisition Date, the Company paid $24,215 in cash consideration, net of cash acquired of $1,746. Of the cash consideration paid, $3,750 was held in escrow to secure indemnification obligations, which has not been released as of the filing date of this Quarterly Report on Form 10-Q. The Company incurred $775 in acquisition-related costs which were recorded in operating expenses for the three and nine months ended September 30, 2013.
	Fair value of acquired assets and liabilities assumed
	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:
		Estimated			Estimated
		Fair Value in USD			Useful Life (in years)
	Tangible assets acquired	$	2,754		N/A
	Liabilities assumed	(1,256		)	N/A
	Customer relationships	1,300			2
	Non-compete agreements	500			3
	Core/developed technology	3,850			5
	Goodwill	18,813			Indefinite
		$	25,961
	Abaca Technology Corporation
	On July 19, 2013 (the "Abaca Technology Acquisition Date"), pursuant to the terms of an Agreement and Plan of Merger, a wholly-owned subsidiary of the Company merged with and into Abaca Technology Corporation ("Abaca Technology"), with Abaca Technology surviving as a wholly-owned subsidiary of the Company. Abaca Technology specializes in email filtering and protection algorithms and their cloud-based, in-memory threat scoring technologies are expected to complement the Company's continued investment in anti-spam and threat detection capabilities.
	At September 30, 2013, the Company completed the valuation of the estimated fair values of the acquired tangible and identifiable intangible assets and liabilities at the Abaca Technology Acquisition Date, and the results of operations and the fair values of the acquired assets and liabilities assumed have been included in the accompanying Condensed Consolidated Financial Statements since the Abaca Technology Acquisition Date. The Company recorded $121 in revenue from Abaca Technology for the nine months ended September 30, 2013.
	At the Abaca Technology Acquisition Date, the Company paid $23 in cash consideration, net of cash acquired of $3. The purchase consideration included an additional amount of $1,520 which was held back to secure contingent liabilities related to indemnification obligations. The initial fair values of the contingent liabilities of $1,397 were recorded in Other long term liabilities in the accompanying Condensed Consolidated Balance Sheets. The indemnification obligations have not been released as of the filing date of this Quarterly Report on Form 10-Q. The Company incurred $254 in acquisition-related costs which were recorded in operating expenses for the three and nine months ended September 30, 2013.
	Fair value of acquired assets and liabilities assumed
	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:
		Estimated			Estimated
		Fair Value in USD			Useful Life (in years)
	Tangible assets acquired	$	311		N/A
	Liabilities assumed	(975		)	N/A
	Customer relationships	40			3
	Core/developed technology	1,770			5
	Goodwill	277			Indefinite
		$	1,423
	eDynamics, LLC
	On July 10, 2013 (the "eDynamics Acquisition Date"), pursuant to the terms of an Asset Purchase Agreement. the Company purchased substantially all of the business intellectual property and assumed certain liabilities of eDynamics, LLC ("eDynamics"). eDynamics is a social media archiving company and is expected to be an integral part of the Company's broader effort in rolling out a comprehensive social media archiving platform for customers.
	At September 30, 2013, the Company completed the valuation of the estimated fair values of the acquired tangible and identifiable intangible assets and liabilities assumed at the eDynamics Acquisition Date, and the results of operations and the fair values of the acquired assets and liabilities assumed have been included in the accompanying Condensed Consolidated Financial Statements since the eDynamics Acquisition Date. Revenue from eDynamics was immaterial for the nine months ended September 30, 2013.
	At the eDynamics Acquisition Date, the Company paid $500 in cash consideration. The Company also agreed to pay earn-out consideration ("Acquisition-related contingent earn-out liability") of up to $600 through April 2014, such liability being contingent upon the achievement of specified product development milestones. The initial fair value of the contingent earn-out liability of $586 was recorded as part of the purchase consideration. The purchase consideration also included an additional amount of $100, which was held back to secure any claims that may arise in the 12-month period after the eDynamics Acquisition Date. The initial fair value of such amount withheld of $72 as well as the contingent earn-out liability were recorded in Accrued liabilities on the accompanying Condensed Consolidated Balance Sheets. The Company incurred $7 in acquisition-related costs which were recorded in operating expenses for the three and nine months ended September 30, 2013.
	Fair value of acquired assets and liabilities assumed
	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:
		Estimated			Estimated
		Fair Value in USD			Useful Life (in years)
	Customer relationships	$	243		3.5
	Non-compete agreements	75			2
	Core/developed technology	733			3.5
	Goodwill	107			Indefinite
		$	1,158
	Mail Distiller Limited
	On April 5, 2013 (the "Mail Distiller Acquisition Date"), pursuant to the terms of a share transfer agreement, the Company purchased all of the outstanding share capital of Mail Distiller Limited, a Northern Ireland Company ("Mail Distiller"). Mail Distiller is a European-based provider of the SaaS email security solutions. Mail Distiller allowed the Company to create the Proofpoint Essentials product line, a suite of SaaS security and compliance solutions specifically designed for distribution across managed service providers and dedicated security resellers.
	At June 30, 2013, the Company completed the valuation of the estimated fair values of the acquired tangible and identifiable intangible assets and liabilities assumed at the Mail Distiller Acquisition Date, and the results of operations and the fair values of the acquired assets and liabilities assumed have been included in the accompanying Condensed Consolidated Financial Statements since the Mail Distiller Acquisition Date. The Company recognized $38 in revenue from Mail Distiller for the nine months ended September 30, 2013.
	At the Mail Distiller Acquisition Date, the Company paid $3,771 in cash consideration, net of cash acquired of $60. The purchase consideration included an additional amount of $669 held back to secure indemnification obligations, which was recorded in Accrued liabilities on the accompanying Condensed Consolidated Balance Sheets. The indemnification obligations have not been released as of the filing date of this Quarterly Report on Form 10-Q. The Company incurred $129 and $256 in acquisition-related costs which were recorded in operating expenses for the three and nine months ended September 30, 2013.
	Fair value of acquired assets and liabilities assumed
	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:
		Estimated			Estimated
		Fair Value in USD			Useful Life (in years)
	Tangible assets acquired	$	204		N/A
	Liabilities assumed	(1,052		)	N/A
	Trade name	7			1
	Customer relationships	1,291			2
	Non-compete agreements	123			2
	Core/developed technology	2,475			7
	Goodwill	1,452			Indefinite
		$	4,500
	Pro Forma Financial Information
	The following unaudited pro forma financial information presents the combined results of operations for the three and nine months ended September 30, 2013 and 2012 as if all the Acquisitions entered into during 2013 had been completed on January 1, 2012, with adjustments to give effect to pro forma events that are directly attributable to the Acquisitions such as amortization expense from acquired intangible assets and acquisition-related transaction costs. The unaudited pro forma results do not reflect any operating efficiencies or potential cost savings which may result from the consolidation of the operations of the Company and Acquisitions. Accordingly, these unaudited pro formas results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the Acquisitions had occurred at the beginning of the period presented, nor are they indicative of future results of operations:
		Three Months Ended September 30,							Nine Months Ended September 30,
	2013				2012			2013			2012
Total revenue	$	35,089			$	28,560		$	100,169		$	81,429
Net loss	(7,183		)		(5,985		)	(18,947		)	(21,565		)
Basic and diluted loss per share	$	(0.20	)		$	(0.19	)	$	(0.55	)	$	(1.01	)
The unaudited pro forma financial information includes non-recurring acquisition-related transaction cost of $1,292 for the nine months ended September 30, 2012.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets (Notes)	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	The goodwill activity and balances are presented below:
	Balance at December 31, 2012	$	18,557
	Add: Goodwill from acquisitions	20,649
	Balance at September 30, 2013	$	39,206
	The goodwill balance as of September 30, 2013 was the result of the acquisitions of Fortiva, Inc., Secure Data in Motion, Inc. (“Sigaba”), Everyone.net, Inc. (“EDN”), GFI Software Ltd., Spam and Open Relay Blocking System (“SORBS”), NextPage, Inc. and the Acquisitions during the nine months ended September 30, 2013.
	Intangible Assets
	Intangible assets excluding goodwill, consisted of the following:
		30-Sep-13							December 31, 2012
		Gross		Accumulated			Net		Gross		Accumulated			Net
		Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
		Amount					Amount		Amount					Amount
	Developed technology	$	26,469	$	(16,469	)	$	10,000	$	17,641	$	(15,163	)	$	2,478
	Customer relationships	5,282		(2,684		)	2,598		2,408		(2,109		)	299
	Non-compete agreements	804		-97			707		106		(27		)	79
	Trademark and patents	105		-62			43		98		(41		)	57
		$	32,660	$	(19,312	)	$	13,348	$	20,253	$	(17,340	)	$	2,913
	Amortization expense of intangibles totaled $909 and $413, respectively, for the three months ended September 30, 2013 and 2012 and $1,973 and $2,864, respectively, for the nine months ended September 30, 2013 and 2012.
	Future estimated amortization expense of intangible assets as of September 30, 2013 is presented below:
	2013, remainder	$	1,093
	2014	4,071
	2015	3,297
	2016	1,877
	2017	1,482
	Thereafter	1,528
		$	13,348

Financial_Instruments_and_Fair

Financial Instruments and Fair Value Measurements (Notes)	9 Months Ended
	Sep. 30, 2013
Fair Value and Financial Instruments Disclosures [Abstract]	'
Fair Value and Financial Instruments Disclosures [Text Block]	'
	Fair Value Measurements and Financial Instruments
	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., the “exit price”) in an orderly transaction between market participants at the measurement date. A hierarchy for inputs used in measuring fair value has been defined to minimize the use of unobservable inputs by requiring the use of observable market data when available. Observable inputs are inputs that market participants would use in pricing the asset or liability based on active market data. Unobservable inputs are inputs that reflect the Company’s assumptions about the assumptions market participants would use in pricing the asset or liability based on the best information available in the circumstances.
	The fair value hierarchy prioritizes the inputs into three broad levels:
	•	Level 1: Quoted (unadjusted) prices in active markets for identical assets or liabilities.
	The Company’s Level 1 assets generally consist of money market funds.
	•	Level 2: Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.
	The Company’s Level 2 assets and liabilities generally consist of corporate bonds and agency debt securities, commercial paper, and certificates of deposit.
	•	Level 3: Unobservable inputs to the valuation methodology that are supported by little or no market activity and that are significant to the measurement of the fair value of the assets or liabilities. Level 3 assets and liabilities include those whose fair value measurements are determined using pricing models, discounted cash flow methodologies or similar valuation techniques, as well as significant management judgment or estimation.
	In connection with the acquisition of eDynamics during the three months ended September 30, 2013, a liability was recognized on the eDynamics Acquisition Date for the estimate of the fair value of the Company's contingent earn-out payments related to eDynamics. The Company determined the fair value of the Acquisition-related contingent earn-out liability based on the probability-based attainment of product development milestones. Any changes to the variables and assumptions could significantly impact the estimated fair values recorded for the liability, resulting in significant charges to the accompanying Condensed Consolidated Statements of Operations. The fair value measurements are based on significant inputs not observable in the market and thus represent Level 3 measurements, which reflect the Company's own assumptions concerning achievement of the product development milestones of eDynamics, in measuring the fair value of the Acquisition-related contingent earn-out liability.
	The following tables summarize, for each category of assets or liabilities, the respective fair value as of September 30, 2013 and December 31, 2012 and the classification by level of input within the fair value hierarchy.
		Balance as of			Quoted Prices		Significant			Significant Unobservable Inputs
		September 30,			in Active		Other			(Level 3)
		2013			Markets for		Observable
					Identical		Inputs
					Assets		(Level 2)
					(Level 1)
	Assets
	Cash equivalents
	Money market funds	$	6,828		$	6,828	$	—		$	—
	Short-term investments:
	Corporate debt securities	15,760			—		15,760			—
	Commercial paper	2,000			—		2,000			—
	Certificates of deposit	2,000			—		2,000			—
	Total financial assets	$	26,588		$	6,828	$	19,760		$	—
	Liabilities
	Acquisition-related contingent earn-out liability	$	592		$	—	$	—		$	592
		Balance as of			Quoted Prices		Significant
		December 31,			in Active		Other
		2012			Markets for		Observable
					Identical		Inputs
					Assets		(Level 2)
					(Level 1)
	Assets
	Cash equivalents:
	Money market funds	$	26,485		$	26,485	$	—
	Commercial paper	1,020			1,020		—
	Short-term investments:
	Corporate debt securities	29,267			—		29,267
	Commercial paper	15,988			—		15,988
	Certificates of deposit	2,008			—		2,008
	Total financial assets	$	74,768		$	27,505	$	47,263
	The following table represents a reconciliation of the Acquisition-related contingent earn-out liability measured at fair value on a recurring basis, using significant unobservable inputs (Level 3) for the nine months ended September 30, 2013:
			Fair Value Measurements Using Significant Unobservable Inputs
			(Level 3)
	Balance at December 31, 2012		$	—
	Additions during the period		586
	Adjustments to fair value during the period recorded in General and Administrative expenses		6
	Balance at September 30, 2013		$	592
	Financial Instruments
	The cost and fair value of the Company’s available-for-sale investments as of September 30, 2013 and December 31, 2012 were as follows:
		September 30, 2013
		Cost Basis			Unrealized		Unrealized			Fair
					Gains		Losses			Value
	Cash and cash equivalents:
	Cash	$	45,000		$	—	$	—		$	45,000
	Money market funds	6,828			—		—			6,828
	Total	$	51,828		$	—	$	—		$	51,828
	Short term investments:
	Corporate debt securities	$	15,761		$	2	$	(3	)	$	15,760
	Commercial paper	2,000			—		—			2,000
	Certificates of deposit	2,000			—		—			2,000
	Total	$	19,761		$	2	$	(3	)	$	19,760
		December 31, 2012
	Cost Basis			Unrealized		Unrealized			Fair
				Gains		Losses			Value
Cash and cash equivalents:
Cash	$	11,749		$	—	$	—		$	11,749
Money market funds	26,485			—		—			26,485
Commercial paper	1,020			—		—			1,020
Total	$	39,254		$	—	$	—		$	39,254
Short term investments:
Corporate debt securities	$	29,266		$	4	$	(3	)	$	29,267
Commercial paper	15,987			1		—			15,988
Certificates of deposit	2,007			1		—			2,008
Total	$	47,260		$	6	$	(3	)	$	47,263
As of September 30, 2013 and December 31, 2012, all investments mature in less than one year. Estimated fair values for marketable securities are based on quoted market prices for the same or similar instruments.

Commitments_and_Contingencies_

Commitments and Contingencies (Notes)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Operating Leases
	The Company has noncancellable operating leases with various expiration dates through May 2017.
	Rent expense was $442 and $393, respectively, for the three months ended September 30, 2013 and 2012 and $1,245 and $1,165, respectively, for the nine months ended September 30, 2013 and 2012.
	Capital Leases
	In July 2012, the Company entered into two lease agreements to lease certain office equipment with expiration dates in July and October 2015. These leases bear an annual interest rate of 4.5% and are secured by fixed assets used in the Company's office locations.
	At September 30, 2013, future annual minimum lease payments under noncancellable operating and capital leases were as follows:
		Capital			Operating
		Leases			Leases
	2013, remainder	$	5		$	1,544
	2014	18			3,948
	2015	11			767
	2016	—			306
	2017	—			130
	Total minimum lease payments	34			$	6,695
	Less: Amount representing interest	(1		)
	Present value of capital lease obligations	33
	Less: Current portion	(17		)
	Long-term portion of capital lease obligations	$	16
	Contingencies
	Under the indemnification provisions of the Company’s customer agreements, the Company agrees to indemnify and defend and hold harmless its customers against, among other things, infringement of any patent, trademark or copyright under any country’s laws or the misappropriation of any trade secret arising from the customers’ legal use of the Company’s solutions. The exposure to the Company under these indemnification provisions is generally limited to the total amount paid by the customers under the applicable customer agreement. However, certain indemnification provisions potentially expose the Company to losses in excess of the aggregate amount paid to the Company by the customer under the applicable customer agreement. To date, there have been no material claims against the Company pursuant to these indemnification provisions.
	Legal Contingencies
	From time to time, the Company is involved in claims and legal proceedings that arise in the ordinary course of business. Based on currently available information, management does not believe that the ultimate outcome of these unresolved matters, individually and in the aggregate, is likely to have a material adverse effect on the Company’s financial position, results of operations or cash flows. However, litigation is subject to inherent uncertainties and the Company’s view of these matters may change in the future. Were an unfavorable outcome to occur, there exists the possibility of a material adverse impact on the Company’s financial position, results of operations or cash flows for the period in which the unfavorable outcome occurs, and potentially in future periods.

Debt_Notes

Debt (Notes)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Debt	'
	Debt
	Equipment Financing Loans
	The Company entered into a new equipment loan agreement with Silicon Valley Bank in April 2011 for an aggregate loan principal amount of $6,000. Interest on the advances is equal to prime rate plus 0.5%. As of September 30, 2013, the interest rate on the outstanding advances was 4.5%. The Company had the ability to draw down on this equipment line through April 19, 2012. Each drawn amount is due 48 months after funding. Borrowings outstanding under the equipment loan at September 30, 2013 were $2,736. Equipment financed under this loan arrangement is collateralized by the respective assets underlying the loan. The terms of the loan restrict the Company’s ability to pay dividends. The loan includes a covenant that requires the Company to maintain cash and cash equivalents plus net accounts receivable of at least two times the amount of all outstanding indebtedness. As of September 30, 2013, the Company was in compliance with the financial covenant.
	Interest expense was $33 and $53, respectively, for the three months ended September 30, 2013 and 2012, and $113 and $162, respectively, for the nine months ended September 30, 2013 and 2012.
	At September 30, 2013, the remaining repayment commitments related to the equipment loans are as follows:
	2013, remainder	$	410
	2014	1,642
	2015	684
		$	2,736
	Third-Party Financing
	As part of the acquisitions of Mail Distiller and Abaca Technology, the Company assumed third-party financing held by each respective company. The third-party financing held by Abaca Technology was paid off in full during the three months ended September 30, 2013. As of September 30, 2013, Mail Distiller had an the outstanding balance of $8.

Stockholders_Equity_Notes

Stockholders' Equity (Notes)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Stockholders' Equity	'
	Stockholders’ Equity
	Initial Public Offering
	In April 2012, the Company completed its initial public offering of its common stock to the public (“IPO”) whereby 5,859 shares of common stock sold by the Company (inclusive of 729 shares of common stock from the partial exercise of the overallotment option granted to the underwriters) and 1,370 shares of common stock sold by the selling shareholders (inclusive of 171 shares of common stock from the partial exercise of the overallotment option granted to the underwriters). The public offering price of the shares sold in the offering was $13.00 per share. The Company did not receive any proceeds from the sales of shares by the selling stockholders. The total gross proceeds from the offering to the Company were $76,200. After deducting underwriters’ discounts and commissions and offering expenses, the aggregate net proceeds received by the Company totaled approximately $68,300. Immediately prior to the closing of the IPO, all shares of the Company’s outstanding redeemable convertible preferred stock automatically converted into 19,567 shares of common stock. As a result, following the IPO, the Company has two classes of authorized stock: Common stock and Preferred stock.
	As of September 30, 2013, the Company is authorized to issue two classes of stock totaling 205,000 shares, of which 5,000 are designated as preferred stock and 200,000 are designated common stock, each with a par value of $0.0001 per share. The Company had 35,786 and 33,044 shares, respectively, issued and outstanding at September 30, 2013 and December 31, 2012.
	On March 30, 2012, the Company's Board of Directors approved a 1-for-2 reverse stock split of the Company's common stock. The reverse stock split became effective on April 2, 2012. All of the share numbers, share prices, and exercise prices have been retrospectively adjusted to reflect the reverse stock split.
	Number of shares of common stock reserved for future issuance was as follows:
		As of		As of
		September 30,		December 31,
		2013		2012
	Options available for future grant under the stock plans	5,741		4,611
	Options outstanding under stock option plans	7,379		9,636
	Shares available for future issuance under ESPP	860		646
	Common stock issuable upon settlement of outstanding restricted stock units	153		1
	Total shares reserved	14,133		14,894
	Stock Option Plan
	On March 30, 2012, the Board of Directors and the Company’s stockholders approved the 2012 Equity Incentive Plan (the "2012 Plan"), which became effective in April 2012. The Company has two equity incentive plans: the Company’s 2002 stock option plan (the “2002 Plan”) and the 2012 Plan. Upon the IPO, all shares that were reserved under the 2002 Plan but not issued, and shares issued but subsequently returned to the plan through forfeitures, cancellations and repurchases became part of the 2012 Plan and no further shares will be granted pursuant to the 2002 Plan. All outstanding stock awards under the 2002 and 2012 Plans (collectively, the "Plan") will continue to be governed by their existing terms. Under the 2012 Plan, the Company has the ability to issue incentive stock options (“ISOs”), nonstatutory stock options (“NSOs”), restricted stock awards, stock bonus awards, stock appreciation rights ("SARs"), restricted stock units (“RSUs”), and performance shares. The 2012 Plan also allows direct issuance of common stock to employees, outside directors and consultants at prices equal to the fair market value at the date of grant of options or issuance of common stock. Additionally, the 2012 Plan provides for the grant of performance cash awards to employees, directors and consultants. The Company has the right to repurchase any unvested shares (at the option exercise price) of common stock issued directly or under option exercises. The right of repurchase generally expires over the vesting period.
	Under the 2002 and 2012 Plans, the term of an option grant shall not exceed ten years from the date of its grant and options generally vest over a three to four-year period, with vesting on a monthly or annual interval. 20,316 shares of common stock were initially reserved for issuance to eligible participants, under the 2012 Plan. As of September 30, 2013, 5,741 shares were available for future grant. Restricted stock awards generally vest over a four-year period with 25% vesting at the end of one year and the remaining vest monthly thereafter. The number of shares available for grant and issuance under the 2012 Plan will be increased automatically on each January 1 of 2013 through 2016 by an amount equal to 5% of the Company's shares outstanding on the immediately preceding December 31, but not to exceed 3,724 shares, unless the Board of Directors, in its discretion, determines to make a smaller increase. On January 1, 2013, the number of shares of the Company's common stock available for grant and issuance under the 2012 Plan increased by 1,652 shares.
	Stock option activity under the Plan was as follows:
		Shares subject to
		Options Outstanding
		Number of		Weighted		Weighted	Aggregate
		Shares		Average		Average	Intrinsic
				Exercise		Remaining	Value
				Price per share		Contractual
						Term
						(in years)
	Balance at December 31, 2012	9,636		$	5.63	7.33	$	64,719
	Options granted	1,380		15.4
	Options exercised	(2,626	)	4.49
	Options forfeited and canceled	(1,011	)	8.35
	Balance at September 30, 2013	7,379		$	7.49	7.15	$	181,727
	The total intrinsic value of options exercised was $39,434 and $10,725, respectively, for the nine months ended September 30, 2013 and 2012. Total cash proceeds from such option exercises were $11,786 and $2,125, respectively, for the nine months ended September 30, 2013 and 2012.
	Restricted Stock Units
	The fair value of each unit is based on the fair value of the Company’s common stock on the date of assumption. A summary of the status of RSUs awarded and unvested under the stock option plans as of September 30, 2013 is presented below:
		RSUs
		Outstanding
		Number of		Granted Fair Value Per Unit
		Shares
	Awarded and unvested at December 31, 2012	1		$	7.98
	Awards granted	166		26.09
	Awards released	(1	)	7.98
	Awards forfeited	(13	)	21.44
	Awarded and unvested at September 30, 2013	153		$	26.49
	Employee Stock Purchase Plan
	On March 30, 2012, the Board of Directors and the Company’s stockholders approved the 2012 Employee Stock Purchase Plan (the "ESPP"), which became effective in April 2012. A total of 745 shares of the Company's common stock were initially reserved for future issuance under the ESPP. The number of shares reserved for issuance under the ESPP will increase automatically on January 1 of each of the first eight years commencing with 2013 by the number of shares equal to 1% of the Company's shares outstanding on the immediately preceding December 31, but not to exceed 1,490 shares, unless the Board of Directors, in its discretion, determines to make a smaller increase. As of September 30, 2013, there were 860 shares of the Company's common stock available for future issuance under the ESPP. On January 1, 2013, the number of shares of the Company's common stock reserved and available for issuance under the ESPP increased by 330 shares.

StockBased_Compensation_Notes

Stock-Based Compensation (Notes)	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-Based Compensation	'
	Stock‑Based Compensation
	The Company recognized stock-based compensation expense under the Plan in the accompanying Condensed Consolidated Statements of Operations as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013		2012
	Cost of subscription revenue	$	203		$	205		$	631	$	443
	Cost of hardware and services revenue	45			20			120		46
	Research and development	502			502			1,566		1,409
	Sales and marketing	881			830			2,502		2,301
	General and administrative	748			390			1,783		1,184
	Total stock-based compensation expense	$	2,379		$	1,947		$	6,602	$	5,383
	The fair value of options granted is estimated on the grant date using the Black‑Scholes option valuation model. This valuation model for stock‑based compensation expense requires the Company to make assumptions and judgments about the variables used in the calculation, including the expected term (weighted‑average period of time that the options granted are expected to be outstanding), the volatility of the common stock price, an assumed risk-free interest rate and the estimated forfeitures of unvested stock options. To the extent actual forfeitures differ from the estimates, the difference will be recorded as a cumulative adjustment in the period estimates are revised. No compensation cost is recorded for options that do not vest and the compensation cost from vested options, whether forfeited or not, is not reversed.
	Prior to the Company's IPO, the Board of Directors, in good faith, determined the fair market values of the Company's common stock, based on the best information available to the Board and the Company's management at the time of grant. The Company performed its analysis in accordance with applicable elements of the practice aid issued by the American Institute of Certified Public Accountants entitled Valuation of Privately Held Company Equity Securities Issued as Compensation. The procedures performed to determine the fair value of the Company's common stock were based on a probability‑weighted expected return method to estimate the aggregate equity value of the Company.
	The weighted average fair value of stock options granted to employees was $16.60 and $7.51, respectively, during the three months ended September 30, 2013 and 2012 and $8.31 and $5.39, respectively, for the nine months ended September 30, 2013 and 2012. The fair values were estimated on the grant dates using the Black‑Scholes option‑pricing model with the following weighted‑average assumptions:
		Three Months Ended			Nine Months Ended
		September 30,			September 30,
		2013		2012	2013		2012
	Expected life (in years)	6.08		6.08	5.31-6.08		5.50-6.08
	Volatility	61%		59%	57-61%		59-60%
	Risk-free interest rate	1.80%		1.00%	0.9-1.8%		1.0-1.2%
	Dividend yield	—%		—%	—%		—%
	The estimate for expected life of options granted reflects the midpoint of the vesting term and the contractual life computed utilizing the simplified method as allowed by the SEC staff. The Company does not have significant historical share option exercise experience and hence considers the expected term assumption calculated using the simplified method to be reasonable. The stock volatility assumptions represent an estimate of the historical volatilities of the common stock of a group of publicly‑traded peer companies that operate in a similar industry. The estimate was determined based on the average historical volatilities of these peer companies. The risk-free interest rate used was the Federal Reserve Bank’s constant maturities interest rate commensurate with the expected life of the options in effect at the time of the grant. The expected dividend yield was zero, as the Company does not anticipate paying a dividend within the relevant time frame. Expected forfeitures are estimated based on the Company’s historical experience.
	The Company realized no income tax benefit from stock option exercises in each of the periods presented due to recurring losses and deferred tax asset valuation allowances.
	As of September 30, 2013, the Company had unamortized stock‑based compensation expense of $15,441 related to stock options, that will be recognized net of forfeitures over the average remaining vesting term of the options of 2.46 years. The Company had $3,058 of unamortized stock‑based compensation expense related to unvested RSUs, which are expected to be recognized over a weighted average period of 3.73 years.
	The fair value of the option component of the ESPP shares was estimated at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:
		Three Months Ended			Nine Months Ended
		September 30,			September 30,
		2013		2012	2013		2012
	Expected life (in years)	n/a		n/a	0.5		0.53
	Volatility	n/a		n/a	40%		51%
	Risk-free interest rate	n/a		n/a	0.10%		0.10%
	Dividend yield	n/a		n/a	—%		—%
	No ESPP shares were issued during the three months ended September 30, 2013. As of September 30, 2013, the Company had $82 of unamortized compensation costs related to the current ESPP offering period, which are expected to be recognized over a weighted average period of 0.08 years.

Net_Loss_per_Share_Notes

Net Loss per Share (Notes)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Net Loss per Share	'
	Net Loss per Share
	Basic net loss per share of common stock is calculated by dividing the net loss by the weighted‑average number of shares of common stock outstanding for the period. The weighted‑average number of shares of common stock used to calculate basic net loss per share of common stock excludes those shares subject to repurchase related to stock options that were exercised prior to vesting as these shares are not deemed to be issued for accounting purposes until they vest. Diluted net loss per share of common stock is computed by dividing the net loss using the weighted‑average number of shares of common stock, excluding common stock subject to repurchase, and, if dilutive, potential shares of common stock outstanding during the period. Basic and diluted net loss per common share was the same for all periods presented as the impact of all potentially dilutive securities outstanding was anti-dilutive.
	The following table presents the potentially dilutive common shares outstanding that were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been anti-dilutive:
		Nine Months Ended
		September 30,
		2013	2012
	Stock options to purchase common stock	7,379	10,205
	Common stock subject to repurchase	2	5
	Restricted stock units	153	23
	Total	7,534	10,233

Segment_Reporting_Notes

Segment Reporting (Notes)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Reporting	'
	Segment Reporting
	Operating segments are reported in a manner consistent with the internal reporting supported and defined by the components of an enterprise about which separate financial information is available, provided and is evaluated regularly by the chief operating decision maker, or decision making group, in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is its chief executive officer. The Company’s chief executive officer reviews financial information presented on a consolidated basis and as a result, the Company concluded that there is only one operating and reportable segment.
	The following sets forth total revenue and long-lived assets by geographic area. Revenue by geography is based upon the billing address of the customer:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Total revenue:
	United States	$	28,241	$	21,966	$	80,038	$	63,272
	Rest of World	6,262		5,118		17,056		14,374
	Total revenue	$	34,503	$	27,084	$	97,094	$	77,646
		As of		As of
		September 30,		December 31,
		2013		2012
	Long-lived assets:
	United States	$	8,728	$	6,857
	Rest of World	1,817		1,703
	Total long‑lived assets	$	10,545	$	8,560

Income_Taxes_Notes

Income Taxes (Notes)	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The Company's quarterly provision for income taxes is based on an estimated effective annual income tax rate. The Company's quarterly provision for income taxes also includes the tax impact of certain unusual or infrequently occurring items, if any, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, in the interim period in which they occur.
	The Company recognized an income tax expense of $207 during the three months ended September 30, 2013 and an income tax benefit of $2,998 during the nine months ended September 30, 2013. These were based on pre-tax losses of $6,982 and $18,645, respectively. Income tax expense for the three and nine months ended September 30, 2012 was $119 and $430 on pre-tax losses of $4,473 and $14,433, respectively. The income tax rate for the three and nine months ended September 30, 2013 varies from the United States statutory income tax rate primarily due to valuation allowances in the United States and certain foreign jurisdictions whereby pre-tax losses and gains in these jurisdictions do not result in the recognition of corresponding income tax benefits and expenses. The income tax rate for the nine months ended September 30, 2013 also varies from the United States statutory rate due to the recognition of a $3,364 deferred income tax benefit related to the release of a valuation allowance in Canada which occurred during the period.
	The Company's effective tax rate for the nine months ended September 30, 2013 increased to 16.1% from (3.0)% for the same prior year period. The current period's effective tax rate was impacted by the recognition of a $3,364 deferred income tax benefit related to the release of a valuation allowance in Canada.
	The Company reviews the likelihood that it will realize the benefit of its deferred tax assets and, therefore, the need for valuation allowances on a quarterly basis. There is no corresponding income tax benefit recognized with respect to losses incurred and no corresponding income tax expense recognized with respect to earnings generated in jurisdictions with a valuation allowance. This causes variability in the Company's effective tax rate. The Company intends to maintain the valuation allowances until it is more likely than not that the net deferred tax assets will be realized.
	In Canada, the Company has historically had cumulative losses in recent years. However, that position changed to a three year cumulative income position during the second quarter of 2013. This position, along with management's analysis of all other available evidence, resulted in the conclusion that the net deferred tax asset in this jurisdiction are more likely than not to be utilized. As such, the valuation allowance previously recorded against the net deferred tax assets has been reversed during the second quarter of 2013.
	As of September 30, 2013, the Company's gross uncertain tax benefits totaled $3,373, excluding related accrued interest and penalties of $214. As of September 30, 2013, $1,238 of the Company's uncertain tax benefits, including related accrued interest and penalties, would affect the effective tax rate if recognized. During the three months ended September 30, 2013, the Company's gross uncertain tax benefits increased $301. The increase is comprised of a $137 increase for tax positions taken in the current period and a $164 increase for tax positions taken in prior period. Of the $164 increase for tax positions taken in a prior period, $154 relate to tax positions for entities which were acquired during the current quarter.
	The Company is not currently under audit by the IRS or any similar taxing authority in any other material jurisdiction. The Company believes it has recorded all appropriate provisions for all jurisdictions and open years. However, the Company can give no assurance that taxing authorities will not propose adjustments that would increase its tax liabilities.

Subsequent_Events_Notes

Subsequent Events (Notes)	9 Months Ended
	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	On October 1, 2013, the Company completed the acquisition of privately-held Sendmail, Inc. ("Sendmail") for $23,000. The results of Sendmail's operations will be included in the accompanying Consolidated Financial Statements following the acquisition date. The Company is currently evaluating the purchase price allocation following the consummation of the transaction. It is not possible to disclose the preliminary purchase price allocation or pro forma combined financial information given the short period of time between acquisition date and the filing of this report.
	In October 2013, the Company entered into an operating lease agreement to rent office space in Taiwan. The lease has a 36-month term and will expire on September 30, 2016.

The_Company_and_Summary_of_Sig1

The Company and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation and Consolidation	'
	Basis of Presentation and Consolidation
	The accompanying unaudited Condensed Consolidated Financial Statements and condensed footnotes have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary (consisting only of normal recurring adjustments) for a fair statement of results for the interim periods presented have been included. The results of operations for the three and nine months ended September 30, 2013 and 2012 are not necessarily indicative of the results to be expected for the year ended December 31, 2013 or for other interim periods or for future years.
	The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated on consolidation. The accompanying Condensed Consolidated Balance Sheet as of December 31, 2012 is derived from audited financial statements as of that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These accompanying Condensed Consolidated Financial Statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's 2012 Annual Report on Form 10-K.
	There have been no material changes to the Company's significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2012 except as otherwise described below
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates and such difference may be material to the financial statements.
Business Combinations	'
	Business Combinations
	The accompanying Condensed Consolidated Financial Statements include the operations of each acquired businesses after the completion of the acquisitions. The Company accounts for acquired businesses using the acquisition method of accounting which requires, among other things, that assets acquired and liabilities assumed be recognized at their estimated fair values as of the acquisition date, while transaction costs are expensed as incurred. The measurement of fair value of assets and liabilities assumed requires significant judgment. Any excess of the purchase price over the fair value of the net assets acquired is recorded as goodwill.
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill represents the excess of the purchase price of the acquired enterprise over the fair value of identifiable assets acquired and liabilities assumed. The Company applies Accounting Standards Codification ("ASC") 350, “Intangibles—Goodwill and Other”, and performs an annual goodwill impairment test during the fourth quarter of the Company’s fiscal year and more frequently if an event or circumstance indicates that an impairment may have occurred. For the purposes of impairment testing, the Company has determined that it has one reporting unit. A two-step impairment test of goodwill is required pursuant to ASC 350-20-35. In the first step, the Company conducts an assessment of qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines that it is more likely than not that the fair value of its reporting unit is less than its carrying amount, it then conducts the second step, a two-part test for impairment of goodwill. The Company first compares the fair value of its reporting unit to its carrying value. If the fair value exceeds the carrying value of the net assets, goodwill is not considered impaired and no further analysis is required. If the carrying value of the net assets exceeds the fair values of the reporting unit, then the second part of the impairment test must be performed in order to determine the implied fair value of the goodwill. The implied fair value of goodwill is calculated by deducting the fair value of all tangible and intangible net assets of the reporting unit, excluding goodwill, from the fair value of the reporting unit as determined in the first step. If the carrying value of the goodwill exceeds the implied fair value, then an impairment loss equal to the difference would be recorded. The identification and measurement of goodwill impairment involves the estimation of the fair value of the Company. The estimate of fair value of the Company, based on the best information available as of the date of the assessment, is subjective and requires judgment, including management assumptions about expected future revenue forecasts and discount rates. No impairment to the carrying value of goodwill was identified to date by the Company during the nine months ended September 30, 2013.
	Intangible assets consist of developed technology, customer relationships, vendor relationships, non-compete arrangements and trademarks and patents. The values assigned to intangibles are based on estimates and judgments regarding expectations for success and life cycle of solutions and technologies acquired.
	Intangible assets are amortized on a straight-line basis over their estimated lives, which approximate the pattern in which the economic benefits of the intangible assets are consumed, typically ranging from one to seven years.
Revenue Recognition	'
	Revenue Recognition
	The Company derives its revenue primarily from two sources: (1) subscription revenue for rights related to the use of the SaaS platform and (2) hardware, training and professional services revenue provided to customers related to their use of the platform. Subscription revenue is derived from a subscription‑based enterprise licensing model with contract terms typically ranging from one to three years, and consist of (i) subscription fees from the licensing of the SaaS platform, (ii) subscription fees for access to the on-demand elements of the platform and (iii) subscription fees for the right to access the Company’s customer support services.
	The Company applies the provision of ASC 985-605, “Software Revenue Recognition", and related interpretations, to all transactions involving the licensing of software, as well as related support, training, and other professional services. ASC 985-605 requires revenue earned on software arrangements involving multiple elements such as software license, support, training and other professional services to be allocated to each element based on the relative fair values of these elements. The fair value of an element must be based on vendor‑specific objective evidence (“VSOE”) of fair value. VSOE of fair value of each element is based on the price charged when the element is sold separately. Revenue is recognized when all of the following criteria are met as set forth in ASC 985-605:
	•	Persuasive evidence of an arrangement exists,
	•	Delivery has occurred,
	•	The fee is fixed or determinable, and
	•	Collectability is probable.
	The Company has analyzed all of the elements included in its multiple element arrangements and has determined that it does not have sufficient VSOE of fair value to allocate revenue to its subscription and software license agreements, support, training, and professional services. The Company defers all revenue under the software arrangement until the commencement of the subscription services and any associated professional services. Once the subscription services and the associated professional services have commenced, the entire fee from the arrangement is recognized ratably over the remaining period of the arrangement. If the professional services are essential to the functionality of the subscription, then the revenue recognition does not commence until such services are completed.
	In the accompanying Condensed Consolidated Statement of Operations, revenue is categorized as "subscription" and "hardware and services." Although the Company is unable to separate its multiple elements under the applicable revenue recognition guidance since it does not have sufficient VSOE of fair value for revenue recognition purposes, the Company has used a systematic and rational estimate to classify revenue between "subscription" and "hardware and services." For presentation purposes only, the Company allocates revenue to hardware and services based upon management's best estimate of fair value of such deliverables using a cost plus model. The remaining consideration of the arrangement is then allocated to subscription services. Management believes that this methodology provides a reasonable basis to allocate revenue between subscription and hardware and services for presentation purposes.
	The hosted on-demand service agreements do not provide customers with the right to take possession of the software supporting the hosted service. The Company recognizes revenue from its hosted on-demand services in accordance with ASC 605-20, and as such recognizes revenue when the following criteria are met:
	•	Persuasive evidence of an arrangement exists,
	•	Delivery of the Company’s obligations to its customers has occurred,
	•	Collection of the fees is probable, and
	•	The amount of fees to be paid by the customer is fixed or determinable.
	In October 2009, the FASB amended the accounting guidance for multiple element arrangements (“ASU 2009-13”) to:
	•	Provide updated guidance on whether multiple deliverables exist, how the deliverables in an arrangement should be separated, and how the arrangement consideration should be allocated among its elements;
	•	Require an entity to allocate revenue in an arrangement that has separate units of accounting using best estimated selling price (“BESP”) of deliverables if a vendor does not have VSOE of fair value or third-party evidence of selling price (“TPE”), and
	•	Eliminate the use of the residual method and require an entity to allocate revenue using the relative selling price method to the separate unit of accounting.
	Concurrently, the FASB amended the accounting guidance for revenue recognition (“ASU 2009-14”) to exclude hardware appliances containing software components and hardware components that function together to deliver the hardware appliance’s essential functionality from the scope of the software revenue recognition guidance of ASC 985-605.
	The Company elected to adopt this new guidance in the first quarter of fiscal 2011 for new and materially modified revenue arrangements originating after January 1, 2011.
	Prior to the adoption of ASU 2009-14, revenue derived from hardware appliance sales were recognized based on the software revenue recognition guidance. The Company could not establish VSOE of fair value for the undelivered elements in the arrangement, and therefore the entire fee from the arrangement was recognized ratably over the contractual term of the agreement. In addition, the Company was unable to establish VSOE of fair value of its hosted on-demand service agreements, and therefore the entire fee for the agreement was recognized ratably over the contractual term of the agreement.
	As a result of the adoption of this accounting guidance, revenue derived from subscription services and hardware appliance sales are no longer subject to industry‑specific software revenue recognition guidance. For all arrangements within the scope of these new accounting pronouncements, including the Company’s hosted on-demand services, the Company evaluates each element in a multiple element arrangement to determine whether it represents a separate unit of accounting. An element constitutes a separate unit of accounting when the delivered item has standalone value and delivery of the undelivered element is probable and within the Company’s control. Revenue derived from the licensing of the SaaS platform continues to be accounted for in accordance with the industry specific revenue recognition guidance.
	Hardware appliance revenue is recognized upon shipment. Subscription and support revenue are recognized over the contract period commencing on the start date of the contract. Professional services and training, when sold with hardware appliances or subscription and support services, are accounted for separately when those services have standalone value. In determining whether professional services and training services can be accounted for separately from subscription and support services, the Company considers the following factors: availability of the services from other vendors, the nature of the services, and the dependence of the subscription services on the customer’s decision to buy the professional services. If professional services and training do not qualify for separate accounting, the Company recognizes the professional services and training ratably over the contract term of the subscription services.
	Delivery generally occurs when the hardware appliance is delivered to a common carrier freight on board shipping point by the Company or the hosted service has been activated and communicated to the customer accordingly. The Company’s fees are typically considered to be fixed or determinable at the inception of an arrangement and are negotiated at the outset of an arrangement, generally based on specific products and quantities to be delivered. In the event payment terms are provided that differ significantly from the Company's standard business practices, the fees are deemed to not be fixed or determinable and revenue is recognized as the fees become paid.
	The Company assesses collectability based on a number of factors, including credit worthiness of the customer and past transaction history of the customer. Through September 30, 2013, the Company experienced no significant credit losses.
Deferred Revenue	'
	Deferred Revenue
	Deferred revenue primarily consists of billings or payments received in advance of revenue recognition from the sale of the Company’s subscription fees, training and professional services. Once the revenue recognition criteria are met, this revenue is recognized ratably over the term of the associated contract, which typically ranges from 12 to 36 months.
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	The carrying amounts of certain of the Company’s cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to their short maturities. Based on borrowing rates that are available to the Company for loans with similar terms and consideration of the Company’s credit risk, the carrying value of the note payable approximates its fair value and is a Level 2 measurement within the fair value hierarchy. The Company has an Acquisition-related contingent earn-out liability that requires Level 3 classification because there are no active markets or observable inputs.
Comprehensive Income (Loss)	'
	Comprehensive Loss
	Comprehensive loss includes all changes in equity that are not the result of transactions with stockholders. The Company’s comprehensive loss consists of its net loss and changes in unrealized gains (losses) from its available-for-sale investments. Total comprehensive loss has been presented in the accompanying Condensed Consolidated Statements of Comprehensive Loss.
	During the nine months ended September 30, 2013, the Company adopted Accounting Standards Update ("ASU") 2013-02, "Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income", which requires filers to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net loss. The Company had no significant reclassifications out of accumulated other comprehensive loss into net loss for the three and nine months ended September 30, 2013 and 2012.
New Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU 2013-11, "Income Taxes", a new accounting standard update on the financial statement presentation of unrecognized tax benefits. The new guidance provides that a liability related to an unrecognized tax benefit would be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The new guidance becomes effective for the Company on January 1, 2014 and it should be applied prospectively to unrecognized tax benefits that exist at the effective date with retrospective application permitted. The Company is currently assessing the impact of this new guidance.

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2013
Business Acquisition [Line Items]	'
Business Acquisition, Pro Forma Information	'
	The following unaudited pro forma financial information presents the combined results of operations for the three and nine months ended September 30, 2013 and 2012 as if all the Acquisitions entered into during 2013 had been completed on January 1, 2012, with adjustments to give effect to pro forma events that are directly attributable to the Acquisitions such as amortization expense from acquired intangible assets and acquisition-related transaction costs. The unaudited pro forma results do not reflect any operating efficiencies or potential cost savings which may result from the consolidation of the operations of the Company and Acquisitions. Accordingly, these unaudited pro formas results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the Acquisitions had occurred at the beginning of the period presented, nor are they indicative of future results of operations:
		Three Months Ended September 30,							Nine Months Ended September 30,
		2013				2012			2013			2012
	Total revenue	$	35,089			$	28,560		$	100,169		$	81,429
	Net loss	(7,183		)		(5,985		)	(18,947		)	(21,565		)
	Basic and diluted loss per share	$	(0.20	)		$	(0.19	)	$	(0.55	)	$	(1.01	)
Armorize [Member]	'
Business Acquisition [Line Items]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:
		Estimated			Estimated
		Fair Value in USD			Useful Life (in years)
	Tangible assets acquired	$	2,754		N/A
	Liabilities assumed	(1,256		)	N/A
	Customer relationships	1,300			2
	Non-compete agreements	500			3
	Core/developed technology	3,850			5
	Goodwill	18,813			Indefinite
		$	25,961
Abaca Technologies [Member]	'
Business Acquisition [Line Items]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:
		Estimated			Estimated
		Fair Value in USD			Useful Life (in years)
	Tangible assets acquired	$	311		N/A
	Liabilities assumed	(975		)	N/A
	Customer relationships	40			3
	Core/developed technology	1,770			5
	Goodwill	277			Indefinite
		$	1,423
eDynamics [Member]	'
Business Acquisition [Line Items]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:
		Estimated			Estimated
		Fair Value in USD			Useful Life (in years)
	Customer relationships	$	243		3.5
	Non-compete agreements	75			2
	Core/developed technology	733			3.5
	Goodwill	107			Indefinite
		$	1,158
Mail Distiller [Member]	'
Business Acquisition [Line Items]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:
		Estimated			Estimated
		Fair Value in USD			Useful Life (in years)
	Tangible assets acquired	$	204		N/A
	Liabilities assumed	(1,052		)	N/A
	Trade name	7			1
	Customer relationships	1,291			2
	Non-compete agreements	123			2
	Core/developed technology	2,475			7
	Goodwill	1,452			Indefinite
		$	4,500

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill Activity and Balance	'
	The goodwill activity and balances are presented below:
	Balance at December 31, 2012	$	18,557
	Add: Goodwill from acquisitions	20,649
	Balance at September 30, 2013	$	39,206
Components of Intangible Assets Excluding Goodwill	'
	Intangible assets excluding goodwill, consisted of the following:
		30-Sep-13							December 31, 2012
		Gross		Accumulated			Net		Gross		Accumulated			Net
		Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
		Amount					Amount		Amount					Amount
	Developed technology	$	26,469	$	(16,469	)	$	10,000	$	17,641	$	(15,163	)	$	2,478
	Customer relationships	5,282		(2,684		)	2,598		2,408		(2,109		)	299
	Non-compete agreements	804		-97			707		106		(27		)	79
	Trademark and patents	105		-62			43		98		(41		)	57
		$	32,660	$	(19,312	)	$	13,348	$	20,253	$	(17,340	)	$	2,913
Future Estimated Amortization Costs of Intangible Assets	'
	Future estimated amortization expense of intangible assets as of September 30, 2013 is presented below:
	2013, remainder	$	1,093
	2014	4,071
	2015	3,297
	2016	1,877
	2017	1,482
	Thereafter	1,528
		$	13,348

Financial_Instruments_and_Fair1

Financial Instruments and Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value and Financial Instruments Disclosures [Abstract]	'
Fair Value of Assets and Liabilities by Level of Input Within the Fair Value Hierarchy	'
	The following tables summarize, for each category of assets or liabilities, the respective fair value as of September 30, 2013 and December 31, 2012 and the classification by level of input within the fair value hierarchy.
		Balance as of			Quoted Prices		Significant			Significant Unobservable Inputs
		September 30,			in Active		Other			(Level 3)
		2013			Markets for		Observable
					Identical		Inputs
					Assets		(Level 2)
					(Level 1)
	Assets
	Cash equivalents
	Money market funds	$	6,828		$	6,828	$	—		$	—
	Short-term investments:
	Corporate debt securities	15,760			—		15,760			—
	Commercial paper	2,000			—		2,000			—
	Certificates of deposit	2,000			—		2,000			—
	Total financial assets	$	26,588		$	6,828	$	19,760		$	—
	Liabilities
	Acquisition-related contingent earn-out liability	$	592		$	—	$	—		$	592
		Balance as of			Quoted Prices		Significant
		December 31,			in Active		Other
		2012			Markets for		Observable
					Identical		Inputs
					Assets		(Level 2)
					(Level 1)
	Assets
	Cash equivalents:
	Money market funds	$	26,485		$	26,485	$	—
	Commercial paper	1,020			1,020		—
	Short-term investments:
	Corporate debt securities	29,267			—		29,267
	Commercial paper	15,988			—		15,988
	Certificates of deposit	2,008			—		2,008
	Total financial assets	$	74,768		$	27,505	$	47,263
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	'
	The following table represents a reconciliation of the Acquisition-related contingent earn-out liability measured at fair value on a recurring basis, using significant unobservable inputs (Level 3) for the nine months ended September 30, 2013:
			Fair Value Measurements Using Significant Unobservable Inputs
			(Level 3)
	Balance at December 31, 2012		$	—
	Additions during the period		586
	Adjustments to fair value during the period recorded in General and Administrative expenses		6
	Balance at September 30, 2013		$	592
Fair Value of Available for Sale Investments	'
	The cost and fair value of the Company’s available-for-sale investments as of September 30, 2013 and December 31, 2012 were as follows:
		September 30, 2013
		Cost Basis			Unrealized		Unrealized			Fair
					Gains		Losses			Value
	Cash and cash equivalents:
	Cash	$	45,000		$	—	$	—		$	45,000
	Money market funds	6,828			—		—			6,828
	Total	$	51,828		$	—	$	—		$	51,828
	Short term investments:
	Corporate debt securities	$	15,761		$	2	$	(3	)	$	15,760
	Commercial paper	2,000			—		—			2,000
	Certificates of deposit	2,000			—		—			2,000
	Total	$	19,761		$	2	$	(3	)	$	19,760
		December 31, 2012
		Cost Basis			Unrealized		Unrealized			Fair
					Gains		Losses			Value
	Cash and cash equivalents:
	Cash	$	11,749		$	—	$	—		$	11,749
	Money market funds	26,485			—		—			26,485
	Commercial paper	1,020			—		—			1,020
	Total	$	39,254		$	—	$	—		$	39,254
	Short term investments:
	Corporate debt securities	$	29,266		$	4	$	(3	)	$	29,267
	Commercial paper	15,987			1		—			15,988
	Certificates of deposit	2,007			1		—			2,008
	Total	$	47,260		$	6	$	(3	)	$	47,263

Commitments_and_Contingencies_1

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Future Annual Minimum Lease Payments Under Noncancelable Operating and Capital Leases	'
	At September 30, 2013, future annual minimum lease payments under noncancellable operating and capital leases were as follows:
		Capital			Operating
		Leases			Leases
	2013, remainder	$	5		$	1,544
	2014	18			3,948
	2015	11			767
	2016	—			306
	2017	—			130
	Total minimum lease payments	34			$	6,695
	Less: Amount representing interest	(1		)
	Present value of capital lease obligations	33
	Less: Current portion	(17		)
	Long-term portion of capital lease obligations	$	16

Debt_Tables

Debt (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Remaining Repayment Commitments	'
	At September 30, 2013, the remaining repayment commitments related to the equipment loans are as follows:
	2013, remainder	$	410
	2014	1,642
	2015	684
		$	2,736

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Number of Shares of Common Stock Reserved for Future Issuance	'
	Number of shares of common stock reserved for future issuance was as follows:
		As of		As of
		September 30,		December 31,
		2013		2012
	Options available for future grant under the stock plans	5,741		4,611
	Options outstanding under stock option plans	7,379		9,636
	Shares available for future issuance under ESPP	860		646
	Common stock issuable upon settlement of outstanding restricted stock units	153		1
	Total shares reserved	14,133		14,894
Activity Under Stock Option Plan	'
	Stock option activity under the Plan was as follows:
		Shares subject to
		Options Outstanding
		Number of		Weighted		Weighted	Aggregate
		Shares		Average		Average	Intrinsic
				Exercise		Remaining	Value
				Price per share		Contractual
						Term
						(in years)
	Balance at December 31, 2012	9,636		$	5.63	7.33	$	64,719
	Options granted	1,380		15.4
	Options exercised	(2,626	)	4.49
	Options forfeited and canceled	(1,011	)	8.35
	Balance at September 30, 2013	7,379		$	7.49	7.15	$	181,727
Summary of RSUs Awarded and Unvested Under Stock Option Plan	'
	A summary of the status of RSUs awarded and unvested under the stock option plans as of September 30, 2013 is presented below:
		RSUs
		Outstanding
		Number of		Granted Fair Value Per Unit
		Shares
	Awarded and unvested at December 31, 2012	1		$	7.98
	Awards granted	166		26.09
	Awards released	(1	)	7.98
	Awards forfeited	(13	)	21.44
	Awarded and unvested at September 30, 2013	153		$	26.49

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'
	The Company recognized stock-based compensation expense under the Plan in the accompanying Condensed Consolidated Statements of Operations as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013		2012
	Cost of subscription revenue	$	203		$	205		$	631	$	443
	Cost of hardware and services revenue	45			20			120		46
	Research and development	502			502			1,566		1,409
	Sales and marketing	881			830			2,502		2,301
	General and administrative	748			390			1,783		1,184
	Total stock-based compensation expense	$	2,379		$	1,947		$	6,602	$	5,383
Share-based Payment Award, Stock Options, Valuation Assumptions	'
	The fair values were estimated on the grant dates using the Black‑Scholes option‑pricing model with the following weighted‑average assumptions:
		Three Months Ended			Nine Months Ended
		September 30,			September 30,
		2013		2012	2013		2012
	Expected life (in years)	6.08		6.08	5.31-6.08		5.50-6.08
	Volatility	61%		59%	57-61%		59-60%
	Risk-free interest rate	1.80%		1.00%	0.9-1.8%		1.0-1.2%
	Dividend yield	—%		—%	—%		—%
Employee Stock Purchase Plan Valuation Assumptions	'
	The fair value of the option component of the ESPP shares was estimated at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:
		Three Months Ended			Nine Months Ended
		September 30,			September 30,
		2013		2012	2013		2012
	Expected life (in years)	n/a		n/a	0.5		0.53
	Volatility	n/a		n/a	40%		51%
	Risk-free interest rate	n/a		n/a	0.10%		0.10%
	Dividend yield	n/a		n/a	—%		—%

Net_Loss_per_Share_Tables

Net Loss per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	'
	The following table presents the potentially dilutive common shares outstanding that were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been anti-dilutive:
		Nine Months Ended
		September 30,
		2013	2012
	Stock options to purchase common stock	7,379	10,205
	Common stock subject to repurchase	2	5
	Restricted stock units	153	23
	Total	7,534	10,233

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Total Revenue and Long-Lived Assets by Geographic Area	'
	The following sets forth total revenue and long-lived assets by geographic area. Revenue by geography is based upon the billing address of the customer:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Total revenue:
	United States	$	28,241	$	21,966	$	80,038	$	63,272
	Rest of World	6,262		5,118		17,056		14,374
	Total revenue	$	34,503	$	27,084	$	97,094	$	77,646
		As of		As of
		September 30,		December 31,
		2013		2012
	Long-lived assets:
	United States	$	8,728	$	6,857
	Rest of World	1,817		1,703
	Total long‑lived assets	$	10,545	$	8,560

The_Company_and_Summary_of_Sig2

The Company and Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Intangible assets:	'
Goodwill, impairment loss	$0
Minimum	'
Intangible assets:	'
Estimated life of intangible assets	'1 year
Maximum	'
Intangible assets:	'
Estimated life of intangible assets	'7 years

The_Company_and_Summary_of_Sig3

The Company and Summary of Significant Accounting Policies - Revenue Recognition (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Accounting Policies [Abstract]	'
Significant credit losses	$0

The_Company_and_Summary_of_Sig4

The Company and Summary of Significant Accounting Policies - Deferred Revenue (Details)	9 Months Ended
	Sep. 30, 2013
Minimum	'
Deferred revenue:	'
Number of months deferred revenue is recognized	'12 months
Maximum	'
Deferred revenue:	'
Number of months deferred revenue is recognized	'36 months

The_Company_and_Summary_of_Sig5

The Company and Summary of Significant Accounting Policies - Comprehensive Loss (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Accounting Policies [Abstract]	'
Reclassification from accumulated other comprehensive income, current period, net of tax	$0

Acquisitions_Details

Acquisitions (Details) (USD $)	9 Months Ended		9 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 05, 2013	Sep. 30, 2013	Jul. 10, 2013	Sep. 30, 2013	Jul. 19, 2013	Sep. 30, 2013	Sep. 30, 2013	Apr. 05, 2013
	Armorize [Member]	Armorize [Member]	eDynamics [Member]	eDynamics [Member]	Abaca Technologies [Member]	Abaca Technologies [Member]	Mail Distiller [Member]	Mail Distiller [Member]	Mail Distiller [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'
Revenue from acquisitions	$183	'	'	'	$121	'	'	$38	'
Payments to acquire businesses, net of cash acquired and holdbacks, total	'	24,215	'	500	'	23	'	'	3,771
Cash acquired from acquisitions	'	1,746	'	'	'	3	'	'	60
Business combinations, amount of cash consideration held in escrow	'	3,750	'	'	'	'	'	'	'
Business combination, indemnification assets, amount as of acquisition date	'	'	'	100	'	1,520	'	'	'
Business combination, indemnification assets amounts, fair value	'	'	'	72	'	1,397	'	'	'
Business combination, Acquisition-related contingent earn-out liability, amount recognized	'	'	'	600	'	'	'	'	669
Business combination, Acquisition-related contingent earn-out liability at fair value	'	'	'	586	'	'	'	'	'
Business combination, acquisition related costs	$775	'	$7	'	$254	'	$129	$256	'

Acquisitions_Fair_Value_of_Ass

Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) (USD $)

Sep. 05, 2013

Jul. 19, 2013

Jul. 10, 2013

Apr. 05, 2013

Sep. 05, 2013

Jul. 19, 2013

Apr. 05, 2013

Sep. 05, 2013

Jul. 19, 2013

Apr. 05, 2013

Sep. 05, 2013

Jul. 19, 2013

Jul. 10, 2013

Apr. 05, 2013

Sep. 05, 2013

Jul. 19, 2013

Jul. 10, 2013

Apr. 05, 2013

Sep. 05, 2013

Jul. 10, 2013

Apr. 05, 2013

Sep. 05, 2013

Jul. 19, 2013

Jul. 10, 2013

Apr. 05, 2013

Apr. 05, 2013

In Thousands, unless otherwise specified

Armorize [Member]

Abaca Technologies [Member]

eDynamics [Member]

Mail Distiller [Member]

Liabilities Assumed in a Business Combination [Member]

Liabilities Assumed in a Business Combination [Member]

Liabilities Assumed in a Business Combination [Member]

Assets Acquired in a Business Combination [Member]

Assets Acquired in a Business Combination [Member]

Assets Acquired in a Business Combination [Member]

Goodwill [Member]

Goodwill [Member]

Goodwill [Member]

Goodwill [Member]

Developed Technology Rights [Member]

Developed Technology Rights [Member]

Developed Technology Rights [Member]

Developed Technology Rights [Member]

Noncompete Agreements [Member]

Noncompete Agreements [Member]

Noncompete Agreements [Member]

Customer Relationships [Member]

Customer Relationships [Member]

Customer Relationships [Member]

Customer Relationships [Member]

Trademarks And Patents [Member]

Armorize [Member]

Abaca Technologies [Member]

Mail Distiller [Member]

Armorize [Member]

Abaca Technologies [Member]

Mail Distiller [Member]

Armorize [Member]

Abaca Technologies [Member]

eDynamics [Member]

Mail Distiller [Member]

Armorize [Member]

Abaca Technologies [Member]

eDynamics [Member]

Mail Distiller [Member]

Armorize [Member]

eDynamics [Member]

Mail Distiller [Member]

Armorize [Member]

Abaca Technologies [Member]

eDynamics [Member]

Mail Distiller [Member]

Mail Distiller [Member]

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated fair value on acquisition date

$25,961

$1,423

$1,158

$4,500

($1,256)

($975)

($1,052)

$2,754

$311

$204

$18,813

$277

$107

$1,452

$3,850

$1,770

$733

$2,475

$500

$75

$123

$1,300

$40

$243

$1,291

$7

Estimated life of intangible assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'5 years

'3 years 6 months

'7 years

'3 years

'2 years

'2 years

'2 years

'3 years

'3 years 6 months

'2 years

'1 year

Acquisitions_Pro_Forma_Informa

Acquisitions - Pro Forma Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'	'	'
Business acquisition, pro forma total revenue	$35,089	$28,560	$100,169	$81,429
Business acquisition, pro forma net loss	-7,183	-5,985	-18,947	-21,565
Business acquisition, pro forma loss per share, basic and diluted	($0.20)	($0.19)	($0.55)	($1.01)
Acquisition-related Costs [Member]	'	'	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'	'	'
Business combination, acquisition related costs	'	'	'	$1,292

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Goodwill (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Goodwill activity and balances	'
Opening balance	$18,557
Goodwill, acquired during period	20,649
Closing balance	$39,206

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Intangible Assets (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

In Thousands, unless otherwise specified

Amortization expense for period [Member]

Amortization expense for period [Member]

Amortization expense for period [Member]

Amortization expense for period [Member]

Developed Technology Rights [Member]

Developed Technology Rights [Member]

Customer Relationships [Member]

Customer Relationships [Member]

Noncompete Agreements [Member]

Noncompete Agreements [Member]

Trademarks And Patents [Member]

Trademarks And Patents [Member]

Intangible assets excluding goodwill:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Finite-lived intangible assets, gross carrying amount

$32,660

$20,253

'

'

'

'

$26,469

$17,641

$5,282

$2,408

$804

$106

$105

$98

Finite-lived intangible assets, accumulated amortization

-19,312

-17,340

'

'

'

'

-16,469

-15,163

-2,684

-2,109

-97

-27

-62

-41

Finite-lived intangible assets, net carrying amount

13,348

2,913

'

'

'

'

10,000

2,478

2,598

299

707

79

43

57

Intangible amortization expense

'

'

909

413

1,973

2,864

'

'

'

'

'

'

'

'

Future estimated amortization costs of intangible assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2013 remainder

1,093

'

'

'

'

'

'

'

'

'

'

'

'

'

2014

4,071

'

'

'

'

'

'

'

'

'

'

'

'

'

2015

3,297

'

'

'

'

'

'

'

'

'

'

'

'

'

2016

1,877

'

'

'

'

'

'

'

'

'

'

'

'

'

2017

1,482

'

'

'

'

'

'

'

'

'

'

'

'

'

Thereafter

1,528

'

'

'

'

'

'

'

'

'

'

'

'

'

Finite-lived intangible assets, net carrying amount

$13,348

$2,913

'

'

'

'

$10,000

$2,478

$2,598

$299

$707

$79

$43

$57

Financial_Instruments_and_Fair2

Financial Instruments and Fair Value Measurements (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Financial instruments and fair value measurements:	'	'	'	'
Maximum maturity duration for all investments	'1 year	'	'	'
Cash and cash equivalents	'	'	'	'
Cash and cash equivalents	$51,828	$39,254	$31,528	$9,767
Unrealized gains	0	0	'	'
Unrealized losses	0	0	'	'
Fair value	51,828	39,254	'	'
Short-term investments	'	'	'	'
Cost basis	19,761	47,260	'	'
Unrealized gains	2	6	'	'
Available for sale securities gross unrealized loss	-3	-3	'	'
Fair value	19,760	47,263	'	'
Cash	'	'	'	'
Cash and cash equivalents	'	'	'	'
Cash and cash equivalents	45,000	11,749	'	'
Unrealized gains	0	0	'	'
Unrealized losses	0	0	'	'
Fair value	45,000	11,749	'	'
Money market funds	'	'	'	'
Cash and cash equivalents	'	'	'	'
Cash and cash equivalents	6,828	26,485	'	'
Unrealized gains	0	0	'	'
Unrealized losses	0	0	'	'
Fair value	6,828	26,485	'	'
Corporate debt securities	'	'	'	'
Short-term investments	'	'	'	'
Cost basis	15,761	29,266	'	'
Unrealized gains	2	4	'	'
Available for sale securities gross unrealized loss	-3	-3	'	'
Fair value	15,760	29,267	'	'
Commercial paper	'	'	'	'
Cash and cash equivalents	'	'	'	'
Cash and cash equivalents	'	1,020	'	'
Unrealized gains	'	0	'	'
Unrealized losses	'	0	'	'
Fair value	'	1,020	'	'
Short-term investments	'	'	'	'
Cost basis	2,000	15,987	'	'
Unrealized gains	0	1	'	'
Available for sale securities gross unrealized loss	0	0	'	'
Fair value	2,000	15,988	'	'
Certificates of deposit	'	'	'	'
Short-term investments	'	'	'	'
Cost basis	2,000	2,007	'	'
Unrealized gains	0	1	'	'
Available for sale securities gross unrealized loss	0	0	'	'
Fair value	2,000	2,008	'	'
Fair value (balance)	'	'	'	'
Financial instruments and fair value measurements:	'	'	'	'
Business combination, Acquisition-related contingent earn-out liability, amount recognized	592	'	'	'
Short-term investments	'	'	'	'
Fair value	26,588	74,768	'	'
Fair value (balance) | Money market funds	'	'	'	'
Cash and cash equivalents	'	'	'	'
Fair value	6,828	26,485	'	'
Fair value (balance) | Corporate debt securities	'	'	'	'
Short-term investments	'	'	'	'
Fair value	15,760	29,267	'	'
Fair value (balance) | Commercial paper	'	'	'	'
Cash and cash equivalents	'	'	'	'
Fair value	'	1,020	'	'
Short-term investments	'	'	'	'
Fair value	2,000	15,988	'	'
Fair value (balance) | Certificates of deposit	'	'	'	'
Short-term investments	'	'	'	'
Fair value	2,000	2,008	'	'
Fair Value, Inputs, Level 1 [Member]	'	'	'	'
Financial instruments and fair value measurements:	'	'	'	'
Business combination, Acquisition-related contingent earn-out liability, amount recognized	0	'	'	'
Short-term investments	'	'	'	'
Fair value	6,828	27,505	'	'
Fair Value, Inputs, Level 1 [Member] | Money market funds	'	'	'	'
Cash and cash equivalents	'	'	'	'
Fair value	6,828	26,485	'	'
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities	'	'	'	'
Short-term investments	'	'	'	'
Fair value	0	0	'	'
Fair Value, Inputs, Level 1 [Member] | Commercial paper	'	'	'	'
Cash and cash equivalents	'	'	'	'
Fair value	'	1,020	'	'
Short-term investments	'	'	'	'
Fair value	0	0	'	'
Fair Value, Inputs, Level 1 [Member] | Certificates of deposit	'	'	'	'
Short-term investments	'	'	'	'
Fair value	0	0	'	'
Fair Value, Inputs, Level 2 [Member]	'	'	'	'
Financial instruments and fair value measurements:	'	'	'	'
Business combination, Acquisition-related contingent earn-out liability, amount recognized	0	'	'	'
Short-term investments	'	'	'	'
Fair value	19,760	47,263	'	'
Fair Value, Inputs, Level 2 [Member] | Money market funds	'	'	'	'
Cash and cash equivalents	'	'	'	'
Fair value	0	0	'	'
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities	'	'	'	'
Short-term investments	'	'	'	'
Fair value	15,760	29,267	'	'
Fair Value, Inputs, Level 2 [Member] | Commercial paper	'	'	'	'
Cash and cash equivalents	'	'	'	'
Fair value	'	0	'	'
Short-term investments	'	'	'	'
Fair value	2,000	15,988	'	'
Fair Value, Inputs, Level 2 [Member] | Certificates of deposit	'	'	'	'
Short-term investments	'	'	'	'
Fair value	2,000	2,008	'	'
Fair Value, Inputs, Level 3 [Member]	'	'	'	'
Financial instruments and fair value measurements:	'	'	'	'
Business combination, Acquisition-related contingent earn-out liability, amount recognized	592	'	'	'
Fair Value, Inputs, Level 3 [Member] | Money market funds	'	'	'	'
Cash and cash equivalents	'	'	'	'
Fair value	0	'	'	'
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities	'	'	'	'
Short-term investments	'	'	'	'
Fair value	0	'	'	'
Fair Value, Inputs, Level 3 [Member] | Commercial paper	'	'	'	'
Short-term investments	'	'	'	'
Fair value	0	'	'	'
Fair Value, Inputs, Level 3 [Member] | Certificates of deposit	'	'	'	'
Short-term investments	'	'	'	'
Fair value	$0	'	'	'
New Equipment Loan Arrangement [Member] | Loans Payable [Member]	'	'	'	'
Financial instruments and fair value measurements:	'	'	'	'
Interest rate at period end	4.50%	'	'	'

Financial_Instruments_and_Fair3

Financial Instruments and Fair Value Measurements Level 3 Reconciliation (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Fair value, measurement with unobservable inputs reconciliations, recurring basis, liability value	$592	$0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, purchases, (sales), issuances, (settlements)	586	'
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings, description	$6	'

Commitments_and_Contingencies_2

Commitments and Contingencies (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]	'	'	'	'
Operating leases rent expense	$442	$393	$1,245	$1,165
Operating Lease Obligations	'	'	'	'
2013 remainder	1,544	'	1,544	'
2014	3,948	'	3,948	'
2015	767	'	767	'
2016	306	'	306	'
2017	130	'	130	'
Total minimum operating lease payments	6,695	'	6,695	'
Future annual minimum lease payments under noncancelable operating and capital leases	'	'	'	'
2013 remainder	5	'	5	'
2014	18	'	18	'
2015	11	'	11	'
2016	0	'	0	'
2017	0	'	0	'
Total minimum capital lease payments	34	'	34	'
Less: Amount representing interest	-1	'	-1	'
Present value of capital lease obligations	33	'	33	'
Less: Current portion	-17	'	-17	'
Long-term portion of captial lease obligations	$16	'	$16	'
Capital leases	'	'	'	'
Commitments and contingencies:	'	'	'	'
Interest rate	4.50%	'	4.50%	'

Debt_Details

Debt (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Apr. 30, 2011	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
					Loans Payable [Member]	Loans Payable [Member]	Loans Payable [Member]	Loans Payable [Member]
					New Equipment Loan Arrangement [Member]	New Equipment Loan Arrangement [Member]	New Equipment Loan Arrangement [Member]	Debt [Member]
							Interest rate in excess of prime rate
Debt:	'	'	'	'	'	'	'	'
Principle amount	'	'	'	'	$6,000	'	'	'
Basis spread on variable rate	'	'	'	'	'	'	0.50%	'
Interest rate at period end	'	'	'	'	'	4.50%	'	'
Duration until repayment date after a loan amount is drawn	'	'	'	'	'48 months	'	'	'
Interest expense	33	53	113	162	'	'	'	'
Repayment commitments	'	'	'	'	'	'	'	'
2013 remainder	'	'	'	'	'	410	'	'
2014	'	'	'	'	'	1,642	'	'
2015	'	'	'	'	'	684	'	'
Carrying amount of long-term debt	'	'	'	'	'	2,736	'	'
Debt assumed as part of acquisition	'	'	'	'	'	'	'	$8

Stockholders_Equity_Initial_Pu

Stockholders' Equity - Initial Public Offering (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Apr. 30, 2012	Apr. 30, 2012	Apr. 30, 2012
In Thousands, except Per Share data, unless otherwise specified	class		Restricted Stock Units (RSUs) [Member]	Restricted Stock Units (RSUs) [Member]	ESPP 2012 Plan [Member]	ESPP 2012 Plan [Member]	Employee Stock Option [Member]	Employee Stock Option [Member]	Common Stock	IPO [Member]	Underwriters Overallotment [Member]
										Common Stock	Common stock from the exercise of the overallotment option of shares granted to the underwriters
Stockholders' Equity:	'	'	'	'	'	'	'	'	'	'	'
Stock issued during period (in shares)	'	'	'	'	'	'	'	'	'	5,859	729
Sale of stock sold by shareholders, shares	'	'	'	'	'	'	'	'	'	1,370	171
IPO Share Price	'	'	'	'	'	'	'	'	'	$13	'
Proceeds from issuance of common stock, gross	'	'	'	'	'	'	'	'	$76,200	'	'
Proceeds from issuance of common stock	'	'	'	'	'	'	'	'	$68,300	'	'
Stock issued from conversion of convertible securities (in shares)	'	'	'	'	'	'	'	'	19,567	'	'
Number of classes of stock the Company is authorized to issue (in classes of stock)	2	'	'	'	'	'	'	'	'	'	'
Total shares authorized (in shares)	205,000	'	'	'	'	'	'	'	'	'	'
Preferred stock authorized (in shares)	5,000	'	'	'	'	'	'	'	'	'	'
Common stock authorized (in shares)	200,000	200,000	'	'	'	'	'	'	'	'	'
Par value of common stock (USD per share)	$0.00	$0.00	'	'	'	'	'	'	'	'	'
Common stock outstanding (in shares)	35,786	33,044	'	'	'	'	'	'	'	'	'
Number of shares of common stock reserved for future issuance	'	'	'	'	'	'	'	'	'	'	'
Options available for future grant under the stock plans	'	'	'	'	'	'	5,741	4,611	'	'	'
Options outstanding under stock option plans	'	'	'	'	'	'	7,379	9,636	'	'	'
Common stock available for issuance ESPP	'	'	'	'	860	646	'	'	'	'	'
Common stock issuable upon settlement of outstanding restricted stock units	'	'	153	1	'	'	'	'	'	'	'
Total shares reserved	14,133	14,894	'	'	'	'	'	'	'	'	'

Stockholders_Equity_Stock_Opti

Stockholders' Equity - Stock Options (Details) (USD $)	0 Months Ended	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
	Employee Stock Option [Member]	Employee Stock Option [Member]	Total Equity Incentive Plans [Member]	2012 Equity Incentive Plan [Member]	2012 Equity Incentive Plan [Member]	2012 Equity Incentive Plan [Member]	2012 Equity Incentive Plan [Member]	2012 Equity Incentive Plan [Member]
			plan			Employee Stock Option [Member]	Employee Stock Option [Member]	Restricted Stock [Member]
						Minimum	Maximum
Stock-based compensation:	'	'	'	'	'	'	'	'
Award First Vesting Period	'	'	'	'	'	'	'	'1 year
Equity incentive plans held by the Company (number of plans)	'	'	2	'	'	'	'	'
Award Expiration Period	'	'	'	'	'	'	'10 years	'
Options available for future grant under the stock plans	4,611	5,741	'	'	'	'	'	'
Award vesting period	'	'	'	'	'	'3 years	'4 years	'4 years
Vesting percentage at one year after grant	'	'	'	'	'	'	'	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	'	'	'	20,316	'	'	'	'
Annual percentage increase in number of shares authorized	'	'	'	5.00%	'	'	'	'
Maximum number of additional shares to be authorized	'	'	'	3,724	'	'	'	'
Increase in number of shares available for grant and issuance	'	'	'	1,652	'	'	'	'
Stock option activity under the Plan:	'	'	'	'	'	'	'	'
Outstanding, beginning of period (in shares)	'	9,636	'	'	'	'	'	'
Options Grants in Period (in shares)	'	1,380	'	'	'	'	'	'
Options Exercises in Period (in shares)	'	-2,626	'	'	'	'	'	'
Options Forfeitures and Cancellations in Period (in shares)	'	-1,011	'	'	'	'	'	'
Outstanding, end of period (in shares)	9,636	7,379	'	'	'	'	'	'
Options outstanding, weighted average exercise price	$5.63	$7.49	'	'	'	'	'	'
Options granted, weighted average exercise price	'	$15.40	'	'	'	'	'	'
Options exercised, weighted average exercise price	'	$4.49	'	'	'	'	'	'
Options forfeitures and cancellations in period, weighted average exercise price	'	$8.35	'	'	'	'	'	'
Options outstanding, weighted average remaining contractual term	'7 years 4 months	'7 years 1 month 24 days	'	'	'	'	'	'
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value	$64,719	$181,727	'	'	'	'	'	'
Total intrinsic value of options exercised	'	'	'	39,434	10,725	'	'	'
Total proceeds from option exercises	'	'	'	$11,786	$2,125	'	'	'

Stockholders_Equity_Restricted

Stockholders' Equity - Restricted Stock Units (Details) (Restricted Stock Units (RSUs) [Member], USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]	'
RSU's Outstanding, Number of Shares:	'
Awarded and unvested at beginning of period (in shares)	1
Awards granted (in shares)	166
Awards released (in shares)	-1
Awards forfeited (in shares)	-13
Awarded and unvested at end of period (in shares)	153
RSUs Outstanding, Granted Fair Value Per Unit:	'
Awarded and unvested at beginning of period (USD per share)	$7.98
Awards granted (USD per share)	$26.09
Awards released (USD per share)	$7.98
Awards forfeited (USD per share)	$21.44
Awarded and unvested at end of period (USD per share)	$26.49

Stockholders_Equity_Employee_S

Stockholders' Equity - Employee Stock Purchase Plan (Details)	Jan. 02, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Mar. 30, 2012
In Thousands, unless otherwise specified		ESPP 2012 Plan [Member]	ESPP 2012 Plan [Member]	Employee Stock Purchase Plan [Member]	Employee Stock Purchase Plan [Member]	Employee Stock Purchase Plan [Member]
				Stock Compensation Plan [Member]	ESPP 2012 Plan [Member]	ESPP 2012 Plan [Member]
						Stock Compensation Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]	'	'	'	'	'	'
Share based compensation arrangement by share based payment award number of shares authorized ESPP	'	'	'	'	'	745
Annual percentage increase in number of shares authorized	'	'	'	'	1.00%	'
Increase in common stock reserved ESPP	330	'	'	'	'	'
Share-based compensation arrangement by share-based payment award, maximum number of shares to be available for grant ESPP	'	'	'	'	'	1,490
Common stock available for issuance ESPP	'	860	646	860	'	'

StockBased_Compensation_Stock_

Stock-Based Compensation - Stock Options and RSUs (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock-based compensation:	'	'	'	'
Stock-based compensation expense	$2,379	$1,947	$6,602	$5,383
Employee Stock Option [Member]	'	'	'	'
Stock-based compensation:	'	'	'	'
Weighted average grant date fair value	$16.60	$7.51	$8.31	$5.39
Fair value assumptions:	'	'	'	'
Expected life (in years)	'6 years 1 month	'6 years 1 month	'	'
Volatility	61.00%	59.00%	'	'
Risk-free interest rate	1.80%	1.00%	'	'
Dividend yield	0.00%	0.00%	0.00%	0.00%
Unamortized stock-based compensation expense	15,441	'	15,441	'
Average remaining vesting term	'	'	'2 years 5 months 16 days	'
Employee Stock Option [Member] | Minimum	'	'	'	'
Fair value assumptions:	'	'	'	'
Expected life (in years)	'	'	'5 years 3 months 22 days	'5 years 6 months
Volatility	'	'	57.00%	59.00%
Risk-free interest rate	'	'	0.90%	1.00%
Employee Stock Option [Member] | Maximum	'	'	'	'
Fair value assumptions:	'	'	'	'
Expected life (in years)	'	'	'6 years 29 days	'6 years 1 month
Volatility	'	'	61.00%	60.00%
Risk-free interest rate	'	'	1.80%	1.20%
Restricted Stock Units (RSUs) [Member]	'	'	'	'
Fair value assumptions:	'	'	'	'
Unamortized stock-based compensation expense	3,058	'	3,058	'
Average remaining vesting term	'	'	'3 years 8 months 23 days	'
Cost of subscription revenue [Member]	'	'	'	'
Stock-based compensation:	'	'	'	'
Stock-based compensation expense	203	205	631	443
Cost of hardware and services revenue [Member]	'	'	'	'
Stock-based compensation:	'	'	'	'
Stock-based compensation expense	45	20	120	46
Research and development [Member]	'	'	'	'
Stock-based compensation:	'	'	'	'
Stock-based compensation expense	502	502	1,566	1,409
Sales and marketing [Member]	'	'	'	'
Stock-based compensation:	'	'	'	'
Stock-based compensation expense	881	830	2,502	2,301
General and administrative [Member]	'	'	'	'
Stock-based compensation:	'	'	'	'
Stock-based compensation expense	$748	$390	$1,783	$1,184

StockBased_Compensation_Employ

Stock-Based Compensation - Employee Stock Purchase Plan (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Stock Option [Member]	'	'	'	'
Employee stock purchase plan:	'	'	'	'
Expected life (in years)	'6 years 1 month	'6 years 1 month	'	'
Volatility	61.00%	59.00%	'	'
Risk-free interest rate	1.80%	1.00%	'	'
Dividend yield	0.00%	0.00%	0.00%	0.00%
Unamortized stock-based compensation expense	$15,441	'	$15,441	'
Average remaining vesting term	'	'	'2 years 5 months 16 days	'
ESPP 2012 Plan [Member]	'	'	'	'
Employee stock purchase plan:	'	'	'	'
Expected life (in years)	'	'	'6 months	'6 months 11 days
Volatility	'	'	40.00%	51.00%
Risk-free interest rate	'	'	0.10%	0.10%
Dividend yield	'	'	0.00%	0.00%
Unamortized stock-based compensation expense	$82	'	$82	'
Average remaining vesting term	'	'	'29 days	'

Net_Loss_per_Share_Details

Net Loss per Share (Details)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total antidillutive securities excluded from computation of earnings per share	7,534	10,233
Stock Options to Purchase Common Stock [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total antidillutive securities excluded from computation of earnings per share	7,379	10,205
Common Stock Subject to Repurchase [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total antidillutive securities excluded from computation of earnings per share	2	5
Restricted Stock Units (RSUs) [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total antidillutive securities excluded from computation of earnings per share	153	23

Segment_Reporting_Details

Segment Reporting (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
	segment		segment
Segment Reporting [Abstract]	'	'	'	'	'
Number of operating and reportable segments	1	'	1	'	'
Segment reporting:	'	'	'	'	'
Total revenue	$34,503	$27,084	$97,094	$77,646	'
Total long-lived assets	10,545	'	10,545	'	8,560
United States	'	'	'	'	'
Segment reporting:	'	'	'	'	'
Total revenue	28,241	21,966	80,038	63,272	'
Total long-lived assets	8,728	'	8,728	'	6,857
Rest of World	'	'	'	'	'
Segment reporting:	'	'	'	'	'
Total revenue	6,262	5,118	17,056	14,374	'
Total long-lived assets	$1,817	'	$1,817	'	$1,703

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Valuation Allowance [Line Items]	'	'	'	'
Income tax expense (benefit)	$207	$119	($2,998)	$430
Loss before provision for income taxes	6,982	4,473	18,645	14,433
Effective income tax rate	'	'	16.10%	-3.00%
Unrecognized tax benefits	3,373	'	3,373	'
Accrued interest and penalties	214	'	214	'
Uncertain tax benefits that would affect effective tax rate if recognized	1,238	'	1,238	'
Increase in gross uncertain tax benefits	301	'	'	'
Increase for tax positions taken in the current period	137	'	'	'
Increase for tax positions taken in prior periods	164	'	'	'
Unrecognized tax benefits, increase resulting from acquisition	154	'	'	'
Foreign Tax Authority [Member]	'	'	'	'
Valuation Allowance [Line Items]	'	'	'	'
Valuation allowance, deferred tax asset, change in amount	'	'	$3,364	'

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Oct. 01, 2013
Subsequent Event [Line Items]	'
Payments to Acquire Business, Gross, Subsequent Events	$23,000
Lessee Leasing Arrangements, Operating Leases, Term of Contract	'36 months