Chegg (CHGG) 10-Q 12 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 30, 2014
Document Information [Line Items]	'	'
Entity Registrant Name	'CHEGG, INC	'
Entity Central Index Key	'0001364954	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	83,064,882

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$39,440	$76,864	[1]
Short-term investments	54,376	37,071	[1]
Accounts receivable, net of allowance for doubtful accounts of $276 and $317 at March 31, 2014 and December 31, 2013, respectively	9,345	7,091	[1]
Prepaid expenses	3,025	2,134	[1]
Deferred tax assets	39	37	[1]
Other current assets	2,181	1,112	[1]
Total current assets	108,406	124,309	[1]
Long-term investments	36,671	24,320	[1]
Textbook library, net	113,915	105,108	[1]
Property and equipment, net	18,994	18,964	[1]
Goodwill	49,605	49,545	[1]
Intangible assets, net	3,150	3,311	[1]
Other assets	2,024	1,814	[1]
Total assets	332,765	327,371	[1]
Current liabilities:	'	'
Accounts payable	3,742	4,078	[1]
Deferred revenue	52,116	22,804	[1]
Accrued liabilities	19,826	21,270	[1]
Total current liabilities	75,684	48,152	[1]
Long-term liabilities	'	'
Other liabilities	5,153	4,979	[1]
Total long-term liabilities	5,153	4,979	[1]
Total liabilities	80,837	53,131	[1]
Commitments and contingencies (Note 8)	'	'	[1]
Stockholders' equity:	'	'
Preferred stock, $0.001 par value –10,000,000 shares authorized, no shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	'	'	[1]
Common stock, $0.001 par value – 400,000,000 shares authorized at March 31, 2014 and December 31, 2013, respectively; 82,686,142 and 81,708,202 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	83	82	[1]
Additional paid-in capital	482,718	479,279	[1]
Accumulated other comprehensive income (loss)	1	-6	[1]
Accumulated deficit	-230,874	-205,115	[1]
Total stockholders' equity	251,928	274,240	[1]
Total liabilities and stockholders' equity	$332,765	$327,371	[1]
[1]	Derived from audited consolidated financial statements as of and for the year ended December 31, 2013

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Allowance for doubtful accounts receivable, current	$276	$317
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	82,686,142	81,708,202
Common stock, shares outstanding	82,686,142	81,708,202

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net revenues	$74,393	$61,015
Cost of revenues	65,485	49,454
Gross profit	8,908	11,561
Operating expenses:	'	'
Technology and development	11,320	9,553
Sales and marketing	15,027	13,748
General and administrative	9,840	6,709
Gain on liquidation of textbooks	-1,678	-2,279
Total operating expenses	34,509	27,731
Loss from operations	-25,601	-16,170
Interest and other income (expense), net:	'	'
Interest expense, net	-61	-1,173
Other income (expense), net	120	-297
Total interest and other income (expense), net	59	-1,470
Loss before provision for income taxes	-25,542	-17,640
Provision for income taxes	217	185
Net loss	($25,759)	($17,825)
Net loss per share, basic and diluted	($0.31)	($1.48)
Weighted average shares used to compute net loss per share, basic and diluted	82,181	12,031

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net loss	($25,759)	($17,825)
Other comprehensive income (loss):	'	'
Net change in unrealized loss on available for sale investments	-16	'
Change in foreign currency translation adjustments	23	-29
Other comprehensive income (loss)	7	-29
Total comprehensive loss	($25,752)	($17,854)

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Operating activities	'		'
Net loss	($25,759)		($17,825)
Adjustments to reconcile net loss to net cash provided by operating activities:	'		'
Textbook library depreciation expense	20,095		16,467
Amortization of warrants and deferred loan costs	29		391
Other depreciation and amortization expense	2,035		2,924
Stock-based compensation expense	6,930		4,150
Provision for (recovery of) bad debts	-41		94
Gain on liquidation of textbooks	-1,678		-2,279
Loss from write-offs of textbooks	4,402		2,030
Revaluation of preferred stock warrants	'		401
Change in assets and liabilities:	'		'
Accounts receivable	-2,227		-788
Prepaid expenses and other current assets	-1,902		-1,840
Other assets	-241		2
Accounts payable	-786		-2,999
Deferred revenue	29,312		28,714
Accrued liabilities	-1,098		-56
Other liabilities	71		193
Net cash provided by operating activities	29,142		29,579
Cash flows from investing activities	'		'
Purchases of textbooks	-42,963		-33,488
Proceeds from liquidations of textbooks	11,276		14,306
Purchases of marketable securities	-42,829		'
Proceeds from maturities of marketable securities	13,100		'
Purchases of property and equipment	-1,285		-1,544
Acquisition of business	-500		'
Net cash used in investing activities	-63,201		-20,726
Cash flows from financing activities	'		'
Proceeds from exercise of stock options	89		411
Payment of taxes related to the net share settlement of RSUs	-3,454		'
Net cash provided by (used in) financing activities	-3,365		411
Net increase (decrease) in cash and cash equivalents	-37,424		9,264
Cash and cash equivalents, beginning of period	76,864	[1]	21,030
Cash and cash equivalents, end of period	39,440		30,294
Cash paid during the period for:	'		'
Interest	31		549
Income taxes	360		91
Non-cash investing and financing activities:	'		'
Accrued purchases of long-lived assets	2,661		4,400
Issuance of common stock warrants in connection with consulting services	'		$130
[1]	Derived from audited consolidated financial statements as of and for the year ended December 31, 2013

Background_and_Basis_of_Presen

Background and Basis of Presentation	3 Months Ended
	Mar. 31, 2014
Background and Basis of Presentation	'
	Note 1. Background and Basis of Presentation
	Company and Background
	Chegg, Inc. (Chegg, the Company, we, us, or our), headquartered in Santa Clara, California, was incorporated as a Delaware corporation on July 29, 2005. Chegg is the leading student-first connected learning platform, empowering students to take control of their education to save time, save money and get smarter. We are driven by our passion to help students become active consumers in the educational process. Our integrated platform, which we call the Student Hub, offers products and services that students need throughout the college lifecycle, from choosing a college through graduation and beyond. Our Student Graph builds on the information generated through students’ and other participants’ use of our platform to increasingly enrich the experience for participants as it grows in scale and power the Student Hub. By helping students learn more in less time and at a lower cost, we help them improve the overall return on investment in education. In 2013, nearly seven million students used our platform.
	Basis of Presentation
	The accompanying condensed consolidated balance sheet as of March 31, 2014, the condensed consolidated statements of operations and, the condensed consolidated statements of comprehensive loss for the three months ended March 31, 2014 and 2013, and the condensed consolidated statements of cash flows for the three months ended March 31, 2014 and 2013 and the related footnote disclosures are unaudited. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments, including normal recurring adjustments, necessary to present fairly our financial position as of March 31, 2014 and our results of operations and cash flows for the three months ended March 31, 2014 and 2013. The results of operations and cash flows for the three months ended March 31, 2014 are not necessarily indicative of the results to be expected for the full year.
	We operate in a single segment. Our fiscal year ends on December 31 and in this report we refer to the year ended December 31, 2013 as 2013.
	The condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for 2013, included in our Annual Report on Form 10-K for 2013 filed with the U.S. Securities and Exchange Commission (the SEC).
	There have been no material changes to our significant accounting policies as compared to the significant accounting policies described in our Annual Report on Form 10-K.
	Reverse Stock Split
	In August 2013, our board of directors and stockholders approved an amendment to our certificate of incorporation to effect a two-for-three reverse split of our common stock. The record date of the reverse stock split was September 3, 2013, the date the amendment to our certificate of incorporation was filed with the Delaware Secretary of State. In accordance with our certificate of incorporation, the conversion ratios of the convertible preferred stock were adjusted to reflect the reverse stock split. The number of outstanding shares of convertible preferred stock was not adjusted. Additionally, the par value and the authorized shares of common stock and convertible preferred stock were not adjusted as a result of the reverse stock split. The reverse stock split has been reflected in the accompanying consolidated financial statements and related notes on a retroactive basis for all periods presented.
	Initial Public Offering
	In November 2013, we completed our initial public offering (IPO), whereby 14,400,000 shares of common stock were sold to the public at a price of $12.50 per share.
	Use of Estimates
	The preparation of financial statements in conformity with generally accepted accounting principles in the United States (U.S. GAAP) requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities; the disclosure of contingent assets and liabilities at the date of the financial statements; and the reported amounts of revenue and expenses during the reporting periods. Significant estimates, assumptions and judgments are used for, but not limited to: revenue recognition, recoverability of accounts receivable, determination of the useful lives and salvage value related to our textbook library, valuation of preferred stock warrants, and stock-based compensation expense including estimated forfeitures, accounting for income taxes, useful lives assigned to long-lived assets for depreciation and amortization, impairment of goodwill and long-lived assets, and the valuation of acquired intangible assets. We base our estimates on historical experience, knowledge of current business conditions and various other factors we believe to be reasonable under the circumstances. These estimates are based on management’s knowledge about current events and expectations about actions we may undertake in the future. Actual results could differ from these estimates, and such differences could be material to our financial position and results of operations.
	Recent Accounting Pronouncements
	There have been no material changes to recent accounting pronouncements as compared to recent accounting pronouncements described in our Annual Report on Form 10-K.

Net_Loss_Per_Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 2014
Net Loss Per Share	'
	Note 2. Net Loss Per Share
	Basic net loss per share is computed by dividing net loss by the weighted-average number of shares of common stock outstanding during the period, less the weighted-average unvested common stock subject to repurchase or forfeiture. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including stock options, warrants, RSUs and convertible preferred stock prior to its conversion in our IPO, to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential common shares outstanding would have been anti-dilutive.
	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts):
		Three Months Ended
		March 31,
		2014			2013
	Numerator:
	Net loss	$	(25,759	)	$	(17,825	)
	Denominator:
	Weighted-average common shares outstanding		82,259			12,367
	Less: Weighted-average unvested common shares subject to repurchase or forfeiture		(78	)		(336	)
	Weighted-average common shares used in computing basic and diluted net loss per share		82,181			12,031
	Net loss per share, basic and diluted	$	(0.31	)	$	(1.48	)
	The following potential common shares outstanding were excluded from the computation of diluted net loss per share because including them would have been anti-dilutive (in thousands):
		Three Months Ended March 31,
		2014			2013
	Options to purchase common stock		17,598			12,936
	RSUs		3,991			1,318
	Common stock subject to repurchase or forfeiture		70			298
	Warrants to purchase common stock		1,118			36
	Warrants to purchase convertible preferred  stock		—			1,132
	Convertible preferred stock		—			42,242
	Total common stock equivalents		22,777			57,962

Cash_and_Cash_Equivalents_Inve

Cash and Cash Equivalents Investments and Restricted Cash	3 Months Ended
	Mar. 31, 2014
Cash and Cash Equivalents, Investments and Restricted Cash	'
	Note 3. Cash and Cash Equivalents, Investments and Restricted Cash
	The following tables show our cash and cash equivalents, restricted cash and investments’ adjusted cost, unrealized gain (loss) and fair value (in thousands):
		March 31, 2014							December 31, 2013
		Cost		Net Unrealized Gain/(Loss)			Fair Value		Cost		Net Unrealized Gain/(Loss)			Fair Value
	Cash and cash equivalents:
	Cash	$	25,615	$	—		$	25,615	$	33,322	$	—		$	33,322
	Money market funds		12,605		—			12,605		42,042		—			42,042
	Commercial paper		1,220		—			1,220		1,500		—			1,500
	Total cash and cash equivalents	$	39,440	$	—		$	39,440	$	76,864	$	—		$	76,864
	Short-term investments:
	Commercial paper	$	44,039	$	2		$	44,041	$	35,571	$	—		$	35,571
	Corporate securities		8,830		5			8,835		—		—			—
	Certificate of deposit		1,500		—			1,500		1,500		—			1,500
	Total short-term investments	$	54,369	$	7		$	54,376	$	37,071	$	—		$	37,071
	Long-term investments:
	Corporate securities	$	33,711	$	(40	)	$	33,671	$	24,338	$	(18	)	$	24,320
	U.S. treasuries		2,001		(1	)		2,000		—		—			—
	Agency bond		1,000		—			1,000		—		—			—
		$	36,712	$	(41	)	$	36,671	$	24,338	$	(18	)	$	24,320
	Short-term restricted cash	$	352	$	—		$	352	$	352	$	—		$	352
	Long-term restricted cash		1,350		—			1,350		1,350		—			1,350
	Total restricted cash	$	1,702	$	—		$	1,702	$	1,702	$	—		$	1,702
	The amortized cost and fair value of available-for-sale investments as of March 31, 2014 by contractual maturity were as follows (in thousands):
		Cost		Fair Value
	Due in 1 year or less	$	55,589	$	55,596
	Due in 1-2 years		36,712		36,671
	Investments not due at a single maturity date		12,605		12,605
	Total	$	104,906	$	104,872
	Investments not due at a single maturity date in the preceding table consist of money market fund deposits.
	As of March 31, 2014, we considered the declines in market value of our investment portfolio to be temporary in nature and did not consider any of our investments to be other-than-temporarily impaired. We typically invest in highly-rated securities with a minimum credit rating of A- and a weighted average maturity of nine months, and our investment policy generally limits the amount of credit exposure to any one issuer. The policy requires investments generally to be investment grade, with the primary objective of preserving capital and maintaining liquidity. Fair values were determined for each individual security in the investment portfolio. When evaluating an investment for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates, and our intent to sell, or whether it is more likely than not it will be required to sell, the investment before recovery of the investment’s cost basis. During the three months ended March 31, 2014, we did not recognize any impairment charges.

Fair_Value_Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2014
Fair Value Measurement	'
	Note 4. Fair Value Measurement
	We have established a fair value hierarchy used to determine the fair value of our financial instruments as follows:
	Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.
	Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments.
	Level 3—Inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value; the inputs require significant management judgment or estimation.
	A financial instrument’s classification within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.
	Financial instruments measured and recorded at fair value on a recurring basis as of March 31, 2014 and December 31, 2013 are classified based on the valuation technique level in the tables below (in thousands):
		31-Mar-14
		Total		Quoted Prices		Significant Other		Significant
				in Active		Observable Inputs (Level 2)		Unobservable
				Markets for Identical				Inputs
				Assets				(Level 3)
				(Level 1)
	Assets:
	Cash equivalents:
	Money market funds	$	12,605	$	12,605	$	—	$	—
	Commercial paper		1,220		—		1,220		—
	Short-term investments:
	Commercial paper		44,041		—		44,041		—
	Corporate securities		8,835		—		8,835		—
	Certificate of deposit		1,500		—		1,500		—
	Long-term investments:
	Corporate securities		33,671		—		33,671		—
	U.S. government		2,000		2,000		—		—
	Agency bond		1,000		—		1,000		—
	Total assets measured and recorded at fair value	$	104,872	$	14,605	$	90,267	$	—
	Liabilities:
	Put option liability	$	1,646	$	—	$	—	$	1,646
		31-Dec-13
		Total		Quoted Prices		Significant Other		Significant
				in Active		Observable Inputs (Level 2)		Unobservable
				Markets for Identical				Inputs
				Assets				(Level 3)
				(Level 1)
	Assets:
	Cash equivalents:
	Money market funds	$	42,042	$	42,042	$	—	$	—
	Commercial paper		1,500		—		1,500		—
	Short-term investments:
	Commercial paper		35,571		—		35,571		—
	Certificate of deposit		1,500		—		1,500		—
	Corporate securities, long-term		24,320		—		24,320		—
	Total assets measured and recorded at fair value	$	104,933	$	42,042	$	62,891	$	—
	Liabilities:
	Put option liability	$	1,521	$	—	$	—	$	1,521
	We value our marketable securities based on quoted prices in active markets for identical assets (Level 1 inputs) or inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs) in determining fair value. We classify all of our fixed income available-for-sale securities as having Level 2 inputs. The valuation techniques used to measure the fair value of our financial instruments having Level 2 inputs were derived from non-binding market consensus prices that are corroborated by observable market data, quoted market prices for similar instruments, or pricing models such as discounted cash flow techniques.
	The following table summarizes the change in the fair value of our Level 3 liabilities (in thousands):
		Level 3
		March 31,
		2014
	Beginning balance	$	1,521
	Vesting of put options		125
	Total financial liabilities	$	1,646
	As of March 31, 2014, we did not have observable inputs for the valuation of our put option liability, which relates to a previous acquisition, and provides certain employees of the acquired company the right to require us to acquire vested common shares at a stated contractual price. As shares associated with these put options vest, the liability is recognized as stock-based compensation expense in our condensed consolidated statements of operations and results in a change in our Level 3 liabilities.
	The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while we believe our valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

Acquisition

Acquisition	3 Months Ended
	Mar. 31, 2014
Acquisition	'
	Note 5. Acquisition
	On March 7, 2014, we acquired certain assets from Bookstep LLC, (Bookstep) a California limited liability company to expand our technical resources and research and development capabilities. The total fair value of the purchase consideration was $0.5 million.  In addition, the agreement requires the payment of approximately $2.5 million in cash, payable over two years contingent upon the continuation of services by a certain number of consultants during the period after acquisition. The fair value of the subsequent payments was $2.5 million, which is being accounted for as post-combination compensation expense. The results of operations have been included in our condensed consolidated results of operations from the date of acquisition. This acquisition was not material, to our results in the period of acquisition.
	For the quarter ended March 31, 2014, we incurred $0.1 million of acquisition-related expenses associated with the acquisition which have been included in general and administrative expenses in the condensed consolidated statements of operations.
	The fair value of the intangible assets acquired was determined under the acquisition method of accounting for business combinations. The excess of purchase consideration paid over the fair value of identifiable intangible assets acquired was recorded as goodwill.
	The following table summarizes the fair value of the identifiable intangible assets acquired during the quarter ended March 31, 2014 (in thousands):
	Master service agreement intangible asset	$	400
	Non-compete covenant intangible asset		40
	Goodwill		60
	Fair value of purchase consideration	$	500
	The amounts recorded for goodwill are expected to be deductible for tax purposes.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2014
Goodwill and Intangible Assets	'
	Note 6. Goodwill and Intangible Assets
	Goodwill consists of the following (in thousands):
			March 31,			December 31,
			2014			2013
	Beginning balance		$	49,545		$	49,545
	Additions due to acquisition			60			—
	Ending balance		$	49,605		$	49,545
	Intangible assets consist of the following (in thousands):
		31-Mar-14
		Weighted-Average Amortization			Gross			Accumulated			Net
		Period			Carrying			Amortization			Carrying
		(in months)			Amount						Amount
	Developed technology		46		$	8,008		$	(5,751	)	$	2,257
	Customer list		24			5,472			(5,175	)		297
	Trade name		33			1,182			(1,020	)		162
	Non-compete agreements		34			1,108			(1,065	)		43
	Master service agreement		36			400			(9	)		391
	Total intangible assets				$	16,170		$	(13,020	)	$	3,150
		31-Dec-13
		Weighted-Average			Gross			Accumulated			Net
		Amortization			Carrying			Amortization			Carrying
		Period			Amount						Amount
		(in months)
	Developed technology		46		$	8,008		$	(5,386	)	$	2,622
	Customer list		24			5,472			(5,029	)		443
	Trade name		33			1,182			(942	)		240
	Non-compete agreements		34			1,068			(1,062	)		6
	Total intangible assets				$	15,730		$	(12,419	)	$	3,311
	During the three months ended March 31, 2014 and 2013, amortization expense related to the above acquired intangible assets totaled approximately $0.6 million, and $1.5 million, respectively.
	As of March 31, 2014, the estimated future amortization expense related to our intangible assets, subject to amortization, is as follows (in thousands):
	Remaining nine months of 2014		$	1,656
	2015			1,246
	2016			221
	2017			27
	Total		$	3,150

Debt_Obligations

Debt Obligations	3 Months Ended
	Mar. 31, 2014
Debt Obligations	'
	Note 7. Debt Obligations
	In May 2012, we entered into a term loan facility with the aggregate principal of $20.0 million, or the Term Loan, with interest payable on a monthly basis at the rate of 11.5%. In connection with the Term Loan, we issued preferred stock warrants to the lender. In August 2013, we repaid the loan in full, including the outstanding principal balance of $20.0 million and an end-of-term fee of $850,000.
	On August 12, 2013, we entered into a $50.0 million revolving credit facility with an accordion feature subject to certain financial criteria that would allow us to draw down to $75.0 million in total, with a different financial institution. The revolving credit facility carries, at our election, a base interest rate of the greater of the Federal Funds Rate plus 0.5% or one-month LIBOR plus 1%, or Prime, or a LIBOR based interest rate plus additional interest of up to 4.5% depending on our leverage ratio. The revolving credit facility will expire on August 12, 2016. The revolving credit facility requires us to repay the outstanding balance at expiration, or to prepay the outstanding balance, if certain reporting and financial covenants are not maintained. These financial covenants are as follows: (1) maintain specified quarterly levels of consolidated EBITDA, which is defined as net income (loss) before tax plus interest expense, provision for income taxes, depreciation and amortization expense, non-cash stock-based compensation expense and costs and expenses not to exceed $2.0 million in closing fees related to the revolving credit facility; and (2) maintain a leverage ratio greater than 1.5 to 1.0 as of the end of each quarter, based on the ratio of the consolidated outstanding debt balance to consolidated EBITDA for the period of the four fiscal quarters most recently ended. As of March 31, 2014, we were in compliance with these financial covenants. On August 12, 2013, we drew down $21.0 million in proceeds and with these proceeds we repaid our $20.0 million Term Loan in full. On October 18, 2013, we drew down an additional $10.0 million in proceeds. On November 18, 2013, we repaid the $31.0 million outstanding balance in full.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies	'
	Note 8. Commitments and Contingencies
	We lease our office and warehouse facilities under operating leases, which expire at various dates through 2019. Our primary operating lease commitments at March 31, 2014, related to our headquarters in Santa Clara, California, and our warehouse in Shepardsville, Kentucky. We recognize rent expense on a straight-line basis over the lease period. Where leases contain escalation clauses, rent abatements, or concessions, such as rent holidays and landlord or tenant incentives or allowances, we apply them in the determination of straight-line rent expense over the lease term. Rental expense, net of sublease income was approximately $0.8 million and $0.7 million, in the three months ended March 31, 2014 and 2013, respectively.
	From time to time, third parties may assert patent infringement claims against us in the form of letters, litigation, or other forms of communication. In addition, from time to time, we may be subject to other legal proceedings and claims in the ordinary course of business, including claims of alleged infringement of trademarks, copyrights, and other intellectual property rights; employment claims; and general contract or other claims. We may, from time to time, also be subject to various legal or government claims, disputes, or investigations. Such matters may include, but not be limited to, claims, disputes, or investigations related to warranty, refund, breach of contract, employment, intellectual property, government regulation, or compliance or other matters.
	In July 2010, the Kentucky Tax Authority issued a property tax assessment of approximately $1.0 million related to our textbook library located in our Kentucky warehouse for the 2009 and 2010 tax years under audit. In March 2011, we filed a protest with the Kentucky Board of Tax Appeals that was rejected in March 2012. In September 2012, we filed a complaint seeking declaratory rights against the Commonwealth of Kentucky in the Bullitt Circuit Court of Kentucky, and that case was subsequently dismissed in favor of administration remedies with the Kentucky Tax Authority. We received a final Notice of Tax due in October 2012 from the Kentucky Tax Authority and we appealed this notice in November 2012 with the Kentucky Board of Tax Appeals. In May 2013, we presented an Offer in Judgment to the Tax Authority of approximately $150,000, excluding tax and penalties, an amount that we have accrued for the two years under audit. We accrued this amount as of December 31, 2012. We appealed to the Kentucky Board of Tax Appeals on July 23, 2013 and the Board issued a ruling in favor of the Department of Revenue on January 13, 2014. On February 7, 2014, we filed an appeal to the Franklin Circuit Court in Kentucky. Due to the preliminary status and uncertainties related to this matter, we are unable to evaluate the likelihood of either a favorable or unfavorable outcome. We believe that it is reasonably possible that we will incur a loss; however, we cannot currently estimate a range of any possible losses we may experience in connection with this case. Accordingly, we are unable at this time to estimate the effects of this matter on our financial condition, results of operations, or cash flows.
	We are not aware of any other pending legal matters or claims, individually or in the aggregate, that are expected to have a material adverse impact on our consolidated financial position, results of operations, or cash flows. However, our analysis of whether a claim may proceed to litigation cannot be predicted with certainty, nor can the results of litigation be predicted with certainty. Nevertheless, defending any of these actions, regardless of the outcome, may be costly, time consuming, distract management personnel, and have a negative effect on our business. An adverse outcome in any of these actions, including a judgment or settlement, may cause a material adverse effect on our future business, operating results, and/or financial condition.

Guarantees_and_Indemnification

Guarantees and Indemnifications	3 Months Ended
	Mar. 31, 2014
Guarantees and Indemnifications	'
	Note 9. Guarantees and Indemnifications
	We have agreed to indemnify our directors and officers for certain events or occurrences, subject to certain limits, while such persons are or were serving at our request in such capacity. We may terminate the indemnification agreements with these persons upon termination of employment, but termination will not affect claims for indemnification related to events occurring prior to the effective date of termination. We have a directors’ and officers’ insurance policy that limits our potential exposure up to the limits of our insurance coverage. In addition, we also have other indemnification agreements with various vendors against certain claims, liabilities, losses, and damages. The maximum amount of potential future indemnification is unlimited.

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2014
Stock-Based Compensation	'
	Note 10. Stock-Based Compensation
	Total stock-based compensation expense recorded for employees and non-employees, is as follows (in thousands):
		Three Months Ended
		March 31,
		2014			2013
	Cost of revenues	$	178		$	154
	Technology and development		2,382			1,614
	Sales and marketing		1,332			1,049
	General and administrative		3,038			1,333
	Total stock-based compensation expense	$	6,930		$	4,150
	We estimate the fair value of each stock option award using the Black-Scholes-Merton option-pricing model, which utilizes the estimated fair value of our common stock and requires the input of subjective assumptions.
	The following table summarizes the key assumptions used to determine the fair value of our stock options granted to employees, officers, and directors:
		Three Months Ended
		March 31,
		2014			2013
	Expected term (years)		6.07			5.98
	Expected volatility		56.83	%		57.06	%
	Dividend yield		0	%		0	%
	Risk-free interest rate		2.02	%		1.01	%
	Weighted-average grant-date fair value per share	$	4.28		$	3.1
	The following key assumptions were used to determine the fair value of our 2013 ESPP which had its first offering period open in November 2013: expected term 0.5 years, expected volatility 45%, dividend yield 0%, risk-free interest rate 0.10% and weighted-average grant-date fair value per share of $3.44 per share.
	We recognize only the portion of the option award granted to employees that is ultimately expected to vest as compensation expense. Estimated forfeitures are determined based on historical data and management’s expectation of exercise behaviors. Forfeiture rates and the resulting compensation expense are revised in subsequent periods if actual forfeitures differ from the estimate.
	No option awards were granted to consultants in the three months ended March 31, 2014 or 2013. Total stock-based compensation expense for consultants was not significant for the three months ended March 31, 2014 or 2013.
	There was no capitalized stock-based compensation as of March 31, 2014 or March 31, 2013.
	Stock Option Activity
	Option activity under our option plans was as follows:
		Options Outstanding
		Number of			Weighted-			Aggregate
		Options			Average			Intrinsic
		Outstanding			Exercise			Value
					Price per
					Share
	Balance at December 31, 2013		17,971,969		$	8.35		$	22,253,373
	Granted		168,632		$	7.85
	Exercised		(222,607	)	$	0.4
	Cancelled		(319,637	)	$	8.26
	Balance at March 31, 2014		17,598,357		$	8.45		$	8,888,254
	As of March 31, 2014, our total unrecognized compensation expense for stock options granted to employees, officers, directors, and consultants was approximately $35.0 million, which will be recognized over a weighted-average vesting period of approximately 2.5 years.
	Restricted Stock Units (RSUs) Activity
		Restricted Stock Units Outstanding
		Number of			Weighted Average Grant Date Fair Value
		RSUs
		Outstanding
	Balance at December 31, 2013		1,479,898		$	10.01
	Granted		3,793,507		$	6.43
	Released		(1,282,852	)	$	9.84
	Cancelled		—		$	—
	Balance at March 31, 2014		3,990,553		$	6.73
	During the three months ended March 31, 2014, 1,256,209  RSUs granted prior to our IPO vested and were settled for shares of our common stock.  Of those shares, we withheld 516,919 shares valued at approximately $3.5 million in satisfaction of tax withholding obligations for employees who elected to net settle, i.e., surrender shares of common stock to satisfy their tax obligations. Payment of taxes related to this net share settlement of RSUs is reflected as a financing activity in our condensed consolidated statements of cash flows. The shares withheld by us as a result of the net settlement are no longer considered issued and outstanding, thereby reducing our shares outstanding used to calculate earnings per share. These shares are returned to the reserves and are available for future issuance under the 2013 Equity Incentive Plan (the 2013 Plan).
	In February 2014, the Compensation Committee approved a grant of performance-based restricted stock units (PSUs) under the Plan to certain of our executive officers. The PSUs entitle the executives to receive a certain number of shares of our common stock based on our satisfaction of certain financial and strategic performance goals, including net revenue growth, digital revenue growth and free cash flow during 2014 (the “Performance Period”). Based on the achievement of the performance conditions during the Performance Period, the final settlement of the PSU awards will range between 0 and 150% of the target shares underlying the PSU awards based on a specified objective formula approved by the Compensation Committee. If earned, the PSUs will vest annually over a three year period.
	The target number of shares underlying the PSUs that were granted to certain executive officers during the three months ended March 31, 2014, totaled 1,184,367 shares and had a weighted average grant date fair value of $6.39 per share. As of March 31, 2014, we expect that 100% of the PSUs will vest.
	As of March 31, 2014, we had a total of approximately $16.1 million of unrecognized compensation costs related to RSUs that is expected to be recognized over the remaining weighted average period of 1.7 years.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Taxes	'
	Note 11. Income Taxes
	We recorded an income tax expense of approximately $0.2 million and $0.2 million for the three months ended March 31, 2014 and 2013, respectively. The income tax expense in both periods was due to state and foreign income tax expense.

RelatedParty_Transactions

Related-Party Transactions	3 Months Ended
	Mar. 31, 2014
Related-Party Transactions	'
	Note 12. Related-Party Transactions
	During the three months ended March 31, 2014 and 2013, we had purchases of $0.2 million and $0.1 million, respectively, of products from Adobe Systems, or Adobe, and revenues of $0.8 million and $0, respectively, for which our Chief Executive Officer is a member of the Board of Directors. As of March 31, 2014, we had $0.8 million of outstanding accounts receivable and no payables to Adobe.  There was no outstanding accounts receivable from and payable to Adobe as of December 31, 2013.
	During the three months ended March 31, 2014, one of our board members was appointed to the Board of Directors of Cengage Learning, or Cengage.   During the three months ended March 31, 2014, we had purchases of $5.9 million of products from Cengage.  As of March 31, 2014, we had accounts payable of $0.2 million and no outstanding accounts receivable from Cengage.
	The terms of our contracts with the above related parties are consistent with our contracts with other independent parties.

Subsequent_Event

Subsequent Event	3 Months Ended
	Mar. 31, 2014
Subsequent Event	'
	Note 13. Subsequent Event
	On April 9, 2014, we acquired The Campus Special, LLC and The Campus Special Food, LLC (“Campus Special”), a company offering local campus deals, serving students at over 500 universities nationwide.  We plan to rebrand this company as Chegg Campus Deals.  We see this acquisition as a future growth opportunity to expand into local and national advertising. This acquisition fits into our long-term strategy to save students money by providing a way for students to save an average of $2,500 a year.  Pursuant to the terms of this purchase agreement, we paid a purchase price of approximately $14.0 million in cash and issued 250,000 shares of our common stock with an acquisition date fair value of $1.6 million.   In addition, the founder is entitled to receive 250,000 shares of common stock as an earn-out payment upon the achievement of certain performance milestones.

Background_and_Basis_of_Presen1

Background and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2014
Basis of Presentation	'
	Basis of Presentation
	The accompanying condensed consolidated balance sheet as of March 31, 2014, the condensed consolidated statements of operations and, the condensed consolidated statements of comprehensive loss for the three months ended March 31, 2014 and 2013, and the condensed consolidated statements of cash flows for the three months ended March 31, 2014 and 2013 and the related footnote disclosures are unaudited. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments, including normal recurring adjustments, necessary to present fairly our financial position as of March 31, 2014 and our results of operations and cash flows for the three months ended March 31, 2014 and 2013. The results of operations and cash flows for the three months ended March 31, 2014 are not necessarily indicative of the results to be expected for the full year.
	We operate in a single segment. Our fiscal year ends on December 31 and in this report we refer to the year ended December 31, 2013 as 2013.
	The condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for 2013, included in our Annual Report on Form 10-K for 2013 filed with the U.S. Securities and Exchange Commission (the SEC).
	There have been no material changes to our significant accounting policies as compared to the significant accounting policies described in our Annual Report on Form 10-K.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with generally accepted accounting principles in the United States (U.S. GAAP) requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities; the disclosure of contingent assets and liabilities at the date of the financial statements; and the reported amounts of revenue and expenses during the reporting periods. Significant estimates, assumptions and judgments are used for, but not limited to: revenue recognition, recoverability of accounts receivable, determination of the useful lives and salvage value related to our textbook library, valuation of preferred stock warrants, and stock-based compensation expense including estimated forfeitures, accounting for income taxes, useful lives assigned to long-lived assets for depreciation and amortization, impairment of goodwill and long-lived assets, and the valuation of acquired intangible assets. We base our estimates on historical experience, knowledge of current business conditions and various other factors we believe to be reasonable under the circumstances. These estimates are based on management’s knowledge about current events and expectations about actions we may undertake in the future. Actual results could differ from these estimates, and such differences could be material to our financial position and results of operations.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	There have been no material changes to recent accounting pronouncements as compared to recent accounting pronouncements described in our Annual Report on Form 10-K.

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2014
Computation of Basic and Diluted Net Loss Per Share	'
	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts):
		Three Months Ended
		March 31,
		2014			2013
	Numerator:
	Net loss	$	(25,759	)	$	(17,825	)
	Denominator:
	Weighted-average common shares outstanding		82,259			12,367
	Less: Weighted-average unvested common shares subject to repurchase or forfeiture		(78	)		(336	)
	Weighted-average common shares used in computing basic and diluted net loss per share		82,181			12,031
	Net loss per share, basic and diluted	$	(0.31	)	$	(1.48	)
Common Shares Outstanding Excluded from Computation of Diluted Net Loss Per Share	'
	The following potential common shares outstanding were excluded from the computation of diluted net loss per share because including them would have been anti-dilutive (in thousands):
		Three Months Ended March 31,
		2014			2013
	Options to purchase common stock		17,598			12,936
	RSUs		3,991			1,318
	Common stock subject to repurchase or forfeiture		70			298
	Warrants to purchase common stock		1,118			36
	Warrants to purchase convertible preferred  stock		—			1,132
	Convertible preferred stock		—			42,242
	Total common stock equivalents		22,777			57,962

Cash_and_Cash_Equivalents_Inve1

Cash and Cash Equivalents, Investments and Restricted Cash (Tables)	3 Months Ended
	Mar. 31, 2014
Cash and Cash Equivalents, Restricted Cash and Investments	'
	The following tables show our cash and cash equivalents, restricted cash and investments’ adjusted cost, unrealized gain (loss) and fair value (in thousands):
		March 31, 2014							December 31, 2013
		Cost		Net Unrealized Gain/(Loss)			Fair Value		Cost		Net Unrealized Gain/(Loss)			Fair Value
	Cash and cash equivalents:
	Cash	$	25,615	$	—		$	25,615	$	33,322	$	—		$	33,322
	Money market funds		12,605		—			12,605		42,042		—			42,042
	Commercial paper		1,220		—			1,220		1,500		—			1,500
	Total cash and cash equivalents	$	39,440	$	—		$	39,440	$	76,864	$	—		$	76,864
	Short-term investments:
	Commercial paper	$	44,039	$	2		$	44,041	$	35,571	$	—		$	35,571
	Corporate securities		8,830		5			8,835		—		—			—
	Certificate of deposit		1,500		—			1,500		1,500		—			1,500
	Total short-term investments	$	54,369	$	7		$	54,376	$	37,071	$	—		$	37,071
	Long-term investments:
	Corporate securities	$	33,711	$	(40	)	$	33,671	$	24,338	$	(18	)	$	24,320
	U.S. treasuries		2,001		(1	)		2,000		—		—			—
	Agency bond		1,000		—			1,000		—		—			—
		$	36,712	$	(41	)	$	36,671	$	24,338	$	(18	)	$	24,320
	Short-term restricted cash	$	352	$	—		$	352	$	352	$	—		$	352
	Long-term restricted cash		1,350		—			1,350		1,350		—			1,350
	Total restricted cash	$	1,702	$	—		$	1,702	$	1,702	$	—		$	1,702
Contractual Maturity of Available-for-Sale Investments	'
	The amortized cost and fair value of available-for-sale investments as of March 31, 2014 by contractual maturity were as follows (in thousands):
		Cost		Fair Value
	Due in 1 year or less	$	55,589	$	55,596
	Due in 1-2 years		36,712		36,671
	Investments not due at a single maturity date		12,605		12,605
	Total	$	104,906	$	104,872

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2014
Financial Instruments Measured and Recorded at Fair Value on Recurring Basis	'
	Financial instruments measured and recorded at fair value on a recurring basis as of March 31, 2014 and December 31, 2013 are classified based on the valuation technique level in the tables below (in thousands):
		31-Mar-14
		Total		Quoted Prices		Significant Other		Significant
				in Active		Observable Inputs (Level 2)		Unobservable
				Markets for Identical				Inputs
				Assets				(Level 3)
				(Level 1)
	Assets:
	Cash equivalents:
	Money market funds	$	12,605	$	12,605	$	—	$	—
	Commercial paper		1,220		—		1,220		—
	Short-term investments:
	Commercial paper		44,041		—		44,041		—
	Corporate securities		8,835		—		8,835		—
	Certificate of deposit		1,500		—		1,500		—
	Long-term investments:
	Corporate securities		33,671		—		33,671		—
	U.S. government		2,000		2,000		—		—
	Agency bond		1,000		—		1,000		—
	Total assets measured and recorded at fair value	$	104,872	$	14,605	$	90,267	$	—
	Liabilities:
	Put option liability	$	1,646	$	—	$	—	$	1,646
		31-Dec-13
		Total		Quoted Prices		Significant Other		Significant
				in Active		Observable Inputs (Level 2)		Unobservable
				Markets for Identical				Inputs
				Assets				(Level 3)
				(Level 1)
	Assets:
	Cash equivalents:
	Money market funds	$	42,042	$	42,042	$	—	$	—
	Commercial paper		1,500		—		1,500		—
	Short-term investments:
	Commercial paper		35,571		—		35,571		—
	Certificate of deposit		1,500		—		1,500		—
	Corporate securities, long-term		24,320		—		24,320		—
	Total assets measured and recorded at fair value	$	104,933	$	42,042	$	62,891	$	—
	Liabilities:
	Put option liability	$	1,521	$	—	$	—	$	1,521
Summarizes the Change in the Fair Value of our Level 3 Liabilities	'
	The following table summarizes the change in the fair value of our Level 3 liabilities (in thousands):
		Level 3
		March 31,
		2014
	Beginning balance	$	1,521
	Vesting of put options		125
	Total financial liabilities	$	1,646

Acquisitions_Tables

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2014
Summary of Fair Value of Identifiable Intangible Assets Acquired	'
	The following table summarizes the fair value of the identifiable intangible assets acquired during the quarter ended March 31, 2014 (in thousands):
	Master service agreement intangible asset	$	400
	Non-compete covenant intangible asset		40
	Goodwill		60
	Fair value of purchase consideration	$	500

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2014
Goodwill	'
	Goodwill consists of the following (in thousands):
			March 31,			December 31,
			2014			2013
	Beginning balance		$	49,545		$	49,545
	Additions due to acquisition			60			—
	Ending balance		$	49,605		$	49,545
Intangible Assets	'
	Intangible assets consist of the following (in thousands):
		31-Mar-14
		Weighted-Average Amortization			Gross			Accumulated			Net
		Period			Carrying			Amortization			Carrying
		(in months)			Amount						Amount
	Developed technology		46		$	8,008		$	(5,751	)	$	2,257
	Customer list		24			5,472			(5,175	)		297
	Trade name		33			1,182			(1,020	)		162
	Non-compete agreements		34			1,108			(1,065	)		43
	Master service agreement		36			400			(9	)		391
	Total intangible assets				$	16,170		$	(13,020	)	$	3,150
		31-Dec-13
		Weighted-Average			Gross			Accumulated			Net
		Amortization			Carrying			Amortization			Carrying
		Period			Amount						Amount
		(in months)
	Developed technology		46		$	8,008		$	(5,386	)	$	2,622
	Customer list		24			5,472			(5,029	)		443
	Trade name		33			1,182			(942	)		240
	Non-compete agreements		34			1,068			(1,062	)		6
	Total intangible assets				$	15,730		$	(12,419	)	$	3,311
Estimated Future Amortization Expense Related to Intangible Assets	'
	As of March 31, 2014, the estimated future amortization expense related to our intangible assets, subject to amortization, is as follows (in thousands):
	Remaining nine months of 2014		$	1,656
	2015			1,246
	2016			221
	2017			27
	Total		$	3,150

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2014
Stock-Based Compensation Expense for Employees and Non-Employees	'
	Total stock-based compensation expense recorded for employees and non-employees, is as follows (in thousands):
		Three Months Ended
		March 31,
		2014			2013
	Cost of revenues	$	178		$	154
	Technology and development		2,382			1,614
	Sales and marketing		1,332			1,049
	General and administrative		3,038			1,333
	Total stock-based compensation expense	$	6,930		$	4,150
Summary of Assumptions Used to Determine Fair Value of Stock Options Granted	'
	The following table summarizes the key assumptions used to determine the fair value of our stock options granted to employees, officers, and directors:
		Three Months Ended
		March 31,
		2014			2013
	Expected term (years)		6.07			5.98
	Expected volatility		56.83	%		57.06	%
	Dividend yield		0	%		0	%
	Risk-free interest rate		2.02	%		1.01	%
	Weighted-average grant-date fair value per share	$	4.28		$	3.1
Summary of Stock Option Activity	'
	Option activity under our option plans was as follows:
		Options Outstanding
		Number of			Weighted-			Aggregate
		Options			Average			Intrinsic
		Outstanding			Exercise			Value
					Price per
					Share
	Balance at December 31, 2013		17,971,969		$	8.35		$	22,253,373
	Granted		168,632		$	7.85
	Exercised		(222,607	)	$	0.4
	Cancelled		(319,637	)	$	8.26
	Balance at March 31, 2014		17,598,357		$	8.45		$	8,888,254
Summary of Restricted Stock Unit Activity	'
		Restricted Stock Units Outstanding
		Number of			Weighted Average Grant Date Fair Value
		RSUs
		Outstanding
	Balance at December 31, 2013		1,479,898		$	10.01
	Granted		3,793,507		$	6.43
	Released		(1,282,852	)	$	9.84
	Cancelled		—		$	—
	Balance at March 31, 2014		3,990,553		$	6.73

Background_and_Basis_of_Presen2

Background and Basis of Presentation - Additional Information (Details) (USD $)	3 Months Ended	1 Months Ended
	Mar. 31, 2014	Nov. 30, 2013
	segment	Initial Public Offering
Background And Basis Of Presentation [Line Items]	'	'
Number of operating segments	1	'
Reverse stock split	'two-for-three reverse split of our common stock	'
Shares of common stock sold in initial public offering	'	14,400,000
Price per share in initial public offering	'	$12.50

Net_Loss_Per_Share_Computation

Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Numerator:	'	'
Net loss	($25,759)	($17,825)
Denominator:	'	'
Weighted-average common shares outstanding	82,259	12,367
Less: Weighted-average unvested common shares subject to repurchase or forfeiture	-78	-336
Weighted-average common shares used in computing basic and diluted net loss per share	82,181	12,031
Net loss per share, basic and diluted	($0.31)	($1.48)

Net_Loss_Per_Share_Common_Shar

Net Loss Per Share - Common Shares Outstanding Excluded From Computation Of Diluted Net Loss Per Share (Details)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'
Total common stock equivalents	22,777	57,962
Options to Purchase Common Stock	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'
Total common stock equivalents	17,598	12,936
RSUs	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'
Total common stock equivalents	3,991	1,318
Common Stock Subject to Repurchase or Forfeiture	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'
Total common stock equivalents	70	298
Common Stock | Warrants to Purchase Common Stock	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'
Total common stock equivalents	1,118	36
Convertible Preferred Stock	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'
Total common stock equivalents	'	42,242
Convertible Preferred Stock | Warrants to Purchase Common Stock	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'
Total common stock equivalents	'	1,132

Cash_and_Cash_Equivalents_Inve2

Cash and Cash Equivalents, Investments and Restricted Cash - Cash and Cash Equivalents, Restricted Cash and Investments (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Cash and Cash Equivalents	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	$39,440	$76,864
Fair Value	39,440	76,864
Short-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	54,369	37,071
Net Unrealized Gain/(Loss)	7	'
Fair Value	54,376	37,071
Long-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	36,712	24,338
Net Unrealized Gain/(Loss)	-41	-18
Fair Value	36,671	24,320
Cash | Cash and Cash Equivalents	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	25,615	33,322
Fair Value	25,615	33,322
Money Market Funds | Cash and Cash Equivalents	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	12,605	42,042
Fair Value	12,605	42,042
Commercial Paper | Cash and Cash Equivalents	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	1,220	1,500
Fair Value	1,220	1,500
Commercial Paper | Short-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	44,039	35,571
Net Unrealized Gain/(Loss)	2	'
Fair Value	44,041	35,571
Certificate of Deposit | Short-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	1,500	1,500
Fair Value	1,500	1,500
U.S. Treasuries | Long-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	2,001	'
Net Unrealized Gain/(Loss)	-1	'
Fair Value	2,000	'
Short-term Restricted Cash	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	352	352
Fair Value	352	352
Long-term Restricted Cash	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	1,350	1,350
Fair Value	1,350	1,350
Restricted Cash	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	1,702	1,702
Fair Value	1,702	1,702
Agency Bond | Long-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	1,000	'
Fair Value	1,000	'
Corporate Securities | Short-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	8,830	'
Net Unrealized Gain/(Loss)	5	'
Fair Value	8,835	'
Corporate Securities | Long-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Cost	33,711	24,338
Net Unrealized Gain/(Loss)	-40	-18
Fair Value	$33,671	$24,320

Cash_and_Cash_Equivalents_Inve3

Cash and Cash Equivalents, Investments and Restricted Cash - Contractual Maturity of Available-for-Sale Investments (Details) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Amortized Cost	'
Due in 1 year or less	$55,589
Due in 1-2 years	36,712
Investments not due at a single maturity date	12,605
Total	104,906
Fair Value	'
Due in 1 year or less	55,596
Due in 1-2 years	36,671
Investments not due at a single maturity date	12,605
Total	$104,872

Fair_Value_Measurement_Financi

Fair Value Measurement - Financial Instruments Measured and Recorded at Fair Value on Recurring Basis (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:	'	'
Short-term investments	$54,376	$37,071	[1]
Fair Value on Recurring Basis	'	'
Assets:	'	'
Long-term investments	'	24,320
Total assets measured and recorded at fair value	104,872	104,933
Liabilities:	'	'
Put option liability	1,646	1,521
Fair Value on Recurring Basis | Corporate securities	'	'
Assets:	'	'
Short-term investments	8,835	'
Long-term investments	33,671	'
Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)	'	'
Assets:	'	'
Total assets measured and recorded at fair value	14,605	42,042
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2)	'	'
Assets:	'	'
Long-term investments	'	24,320
Total assets measured and recorded at fair value	90,267	62,891
Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate securities	'	'
Assets:	'	'
Short-term investments	8,835	'
Long-term investments	33,671	'
Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3)	'	'
Liabilities:	'	'
Put option liability	1,646	1,521
Fair Value on Recurring Basis | Money Market Funds	'	'
Assets:	'	'
Cash equivalents	12,605	42,042
Fair Value on Recurring Basis | Money Market Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)	'	'
Assets:	'	'
Cash equivalents	12,605	42,042
Fair Value on Recurring Basis | Commercial Paper	'	'
Assets:	'	'
Cash equivalents	1,220	1,500
Short-term investments	44,041	35,571
Fair Value on Recurring Basis | Commercial Paper | Significant Other Observable Inputs (Level 2)	'	'
Assets:	'	'
Cash equivalents	1,220	1,500
Short-term investments	44,041	35,571
Fair Value on Recurring Basis | Certificate of Deposit	'	'
Assets:	'	'
Short-term investments	1,500	1,500
Fair Value on Recurring Basis | Certificate of Deposit | Significant Other Observable Inputs (Level 2)	'	'
Assets:	'	'
Short-term investments	1,500	1,500
Fair Value on Recurring Basis | U.S. government	'	'
Assets:	'	'
Long-term investments	2,000	'
Fair Value on Recurring Basis | U.S. government | Quoted Prices in Active Markets for Identical Assets (Level 1)	'	'
Assets:	'	'
Long-term investments	2,000	'
Fair Value on Recurring Basis | Agency bond	'	'
Assets:	'	'
Long-term investments	1,000	'
Fair Value on Recurring Basis | Agency bond | Significant Other Observable Inputs (Level 2)	'	'
Assets:	'	'
Long-term investments	$1,000	'
[1]	Derived from audited consolidated financial statements as of and for the year ended December 31, 2013

Fair_Value_Measurement_Summari

Fair Value Measurement - Summarizes the Change in the Fair Value of our Level 3 Liabilities (Details) (Significant Unobservable Inputs (Level 3), USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Significant Unobservable Inputs (Level 3)	'
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]	'
Beginning balance	$1,521
Vesting of put options	125
Total financial liabilities	$1,646

Acquisition_Additional_Informa

Acquisition - Additional Information (Details) (USD $)	1 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Mar. 07, 2014	Mar. 31, 2014
Business Acquisition [Line Items]	'	'
Fair value of purchase consideration	$0.50	'
Cash paid	2.5	'
Fair value of subsequent payments	2.5	'
Business acquisition payment period	'2 years	'
Acquisition related expenses	'	$0.10

Acquisition_Summary_of_Fair_Va

Acquisition - Summary of Fair Value of Identifiable Intangible Assets Acquired (Details) (USD $)	1 Months Ended					3 Months Ended
In Thousands, unless otherwise specified	Mar. 07, 2014	Mar. 31, 2014	Dec. 31, 2013		Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
						Bookstep L L C	Master Service Agreement	Non Compete Covenant
							Bookstep L L C	Bookstep L L C
Business Acquisition [Line Items]	'	'	'		'	'	'	'
Intangible asset	'	'	'		'	'	$400	$40
Goodwill	'	49,605	49,545	[1]	49,545	60	'	'
Fair value of purchase consideration	$500	'	'		'	$500	'	'
[1]	Derived from audited consolidated financial statements as of and for the year ended December 31, 2013

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Goodwill (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Goodwill [Line Items]	'		'
Beginning balance	$49,545	[1]	$49,545
Additions due to acquisition	60		'
Ending balance	$49,605		$49,545	[1]
[1]	Derived from audited consolidated financial statements as of and for the year ended December 31, 2013

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Intangible Assets (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$16,170	$15,730
Accumulated Amortization	-13,020	-12,419
Net Carrying Amount	3,150	3,311	[1]
Developed Technology	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Weighted-Average Amortization Period	'46 months	'46 months
Gross Carrying Amount	8,008	8,008
Accumulated Amortization	-5,751	-5,386
Net Carrying Amount	2,257	2,622
Customer List	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Weighted-Average Amortization Period	'24 months	'24 months
Gross Carrying Amount	5,472	5,472
Accumulated Amortization	-5,175	-5,029
Net Carrying Amount	297	443
Trade Name	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Weighted-Average Amortization Period	'33 months	'33 months
Gross Carrying Amount	1,182	1,182
Accumulated Amortization	-1,020	-942
Net Carrying Amount	162	240
Non-compete Agreements	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Weighted-Average Amortization Period	'34 months	'34 months
Gross Carrying Amount	1,108	1,068
Accumulated Amortization	-1,065	-1,062
Net Carrying Amount	43	6
Master Service Agreement	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Weighted-Average Amortization Period	'36 months	'
Gross Carrying Amount	400	'
Accumulated Amortization	-9	'
Net Carrying Amount	$391	'
[1]	Derived from audited consolidated financial statements as of and for the year ended December 31, 2013

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Additional Information (Details) (Acquisition-Related Intangible Assets, USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Acquisition-Related Intangible Assets	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Amortization expense of acquisition related to acquired intangible assets	$0.60	$1.50

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite Lived Intangible Assets [Line Items]	'	'
Remaining nine months of 2014	$1,656	'
2015	1,246	'
2016	221	'
2017	27	'
Net Carrying Amount	$3,150	$3,311	[1]
[1]	Derived from audited consolidated financial statements as of and for the year ended December 31, 2013

Debt_Obligations_Additional_In

Debt Obligations - Additional Information (Details) (USD $)	1 Months Ended			0 Months Ended
	Aug. 31, 2013	31-May-12	Mar. 31, 2014	Nov. 18, 2013	Oct. 18, 2013	Aug. 12, 2013	Aug. 12, 2013	Aug. 12, 2013	Aug. 12, 2013
	Term Loan Facility	Term Loan Facility	Term Loan Facility	Revolving Credit Facility	Revolving Credit Facility	Revolving Credit Facility	Revolving Credit Facility	Revolving Credit Facility	Revolving Credit Facility
							Base Interest Rate	LIBOR Rate	LIBOR Rate
Line Of Credit Facility [Line Items]	'	'	'	'	'	'	'	'	'
Credit facility, maximum borrowing capacity	'	$20,000,000	'	'	'	$50,000,000	'	'	'
Term loan facility, interest rate	'	'	11.50%	'	'	'	'	'	'
Term loan facility, interest rate term	'	'monthly	'	'	'	'	'	'	'
Amount of loan principal repaid	20,000,000	'	'	'	'	'	'	'	'
End-of-term fee payable	'	850,000	'	'	'	'	'	'	'
Revolving credit facility, initiation date	'	'	'	'	'	12-Aug-13	'	'	'
Revolving credit facility, current borrowing capacity	'	'	'	'	'	75,000,000	'	'	'
Marginal interest rate	'	'	'	'	'	'	0.50%	4.50%	1.00%
Revolving credit facility, expiration date	'	'	'	'	'	12-Aug-16	'	'	'
Consolidated EBITDA	'	'	'	'	'	2,000,000	'	'	'
Ratio of total debt outstanding to EBITDA	'	'	'	'	'	1.50%	'	'	'
Proceeds from revolving credit facility	'	'	'	'	10,000,000	21,000,000	'	'	'
Repayments of revolving credit facility	'	'	'	$31,000,000	'	$20,000,000	'	'	'

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2012	Jul. 31, 2010
Commitments And Contingencies [Line Items]	'	'	'	'
Rental expense	$800,000	$700,000	'	'
Property tax assessment	'	'	'	1,000,000
Offer to the tax authority excluding tax and penalties	'	'	$150,000	'

StockBased_Compensation_StockB

Stock-Based Compensation - Stock-Based Compensation Expense for Employees and Non-Employees (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	$6,930	$4,150
Cost of revenues	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	178	154
Technology and development	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	2,382	1,614
Sales and marketing	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	1,332	1,049
General and administrative	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	$3,038	$1,333

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Assumptions Used to Determine Fair Value of Stock Options Granted (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'
Expected term (years)	'6 years 26 days	'5 years 11 months 23 days
Expected volatility	56.83%	57.06%
Dividend yield	0.00%	0.00%
Risk-free interest rate	2.02%	1.01%
Weighted-average grant-date fair value per share	$4.28	$3.10

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Details) (USD $)	1 Months Ended	3 Months Ended		1 Months Ended		0 Months Ended	3 Months Ended		12 Months Ended
	Feb. 28, 2014	Mar. 31, 2014	Mar. 31, 2013	Feb. 28, 2014	Feb. 28, 2014	Mar. 15, 2014	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
				Minimum	Maximum	RSUs	RSUs	Performance-based restricted stock units	Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'	'	'	'	'	'	'
Fair value assumptions of expected term of ESPP	'	'6 years 26 days	'5 years 11 months 23 days	'	'	'	'	'	'6 months
Fair value assumptions of expected volatility rate of ESPP	'	56.83%	57.06%	'	'	'	'	'	45.00%
Fair value assumptions of dividend yield of ESPP	'	0.00%	0.00%	'	'	'	'	'	0.00%
Fair value assumptions of risk-free interest rate of ESPP	'	2.02%	1.01%	'	'	'	'	'	0.10%
Weighted-average grant-date fair value per share of ESPP	'	$4.28	$3.10	'	'	'	'	'	$3.44
Options granted to consultants	'	0	0	'	'	'	'	'	'
Unrecognized compensation expense for employees, officers, directors, and consultants	'	$35,000,000	'	'	'	'	'	'	'
Weighted average vesting period for recognition of compensation expense	'	'2 years 6 months	'	'	'	'	'1 year 8 months 12 days	'	'
Pre-IPO shares settled	'	'	'	'	'	1,256,209	'	'	'
Shares withheld	'	'	'	'	'	516,919	'	'	'
Cash remitted to tax authorities related to RSU settlement	'	3,454,000	'	'	'	3,500,000	'	'	'
Settlement of performance based restricted stock unit awards percentage	'	'	'	0.00%	150.00%	'	'	'	'
Performance based restricted stock unit award vesting period	'3 years	'	'	'	'	'	'	'	'
Performance based restricted stock unit award granted to executive officers	'	'	'	'	'	'	3,793,507	1,184,367	'
Performance based restricted stock unit award granted weighted average grant date fair value	'	'	'	'	'	'	$6.43	$6.39	'
Performance based restricted stock unit award vesting percentage	'	'	'	'	'	'	'	100.00%	'
Capitalized stock-based compensation	'	'	'	'	'	'	$16,100,000	'	'

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Stock Option Activity (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Number of Options Outstanding	'
Number of Options Outstanding, Beginning	17,971,969
Number of Options, Granted	168,632
Number of Options, Exercised	-222,607
Number of Options, Cancelled	-319,637
Number of Options Outstanding, Ending	17,598,357
Weighted-Average Exercise Price per Share	'
Weighted Average Exercise Price per Share, Outstanding, Beginning	$8.35
Weighted-Average Exercise Price per Share, Granted	$7.85
Weighted-Average Exercise Price per Share, Exercised	$0.40
Weighted-Average Exercise Price per Share, Cancelled	$8.26
Weighted Average Exercise Price per Share, Outstanding, Ending	$8.45
Aggregate Intrinsic Value	'
Aggregate Intrinsic Value, Beginning	$22,253,373
Aggregate Intrinsic Value, Ending	$8,888,254

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Details) (RSUs, USD $)	3 Months Ended
	Mar. 31, 2014
RSUs	'
Restricted Stock Units Outstanding	'
Number of Restricted Stock Units Outstanding, Beginning	1,479,898
Number of Restricted Stock Units, Granted	3,793,507
Number of Restricted Stock Units, Released	-1,282,852
Number of Restricted Stock Units, Cancelled	'
Number of Restricted Stock Units Outstanding, Ending	3,990,553
Weighted Average Grant Date Fair Value [Abstract]	'
Weighted Average Grant Date Fair Value, Beginning balance	$10.01
Weighted Average Grant Date Fair Value, Granted	$6.43
Weighted Average Grant Date Fair Value, Released	$9.84
Weighted Average Grant Date Fair Value, Cancelled	'
Weighted Average Grant Date Fair Value, Ending balance	$6.73

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Line Items]	'	'
Provision for income taxes	$217	$185

RelatedParty_Transactions_Addi

Related-Party Transactions - Additional Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Adobe Systems	'	'	'
Related Party Transaction [Line Items]	'	'	'
Purchases from related party	$0.20	$0.10	'
Revenue from related parties	0.8	0	'
Due from related parties	0.8	'	0
Due to related parties	0	'	0
Board of Directors of Cengage Learning, or Cengage	'	'	'
Related Party Transaction [Line Items]	'	'	'
Purchases from related party	5.9	'	'
Due from related parties	0	'	'
Due to related parties	$0.20	'	'

Subsequent_Event_Additional_In

Subsequent Event - Additional Information (Detail) (USD $)	3 Months Ended	0 Months Ended
	Mar. 31, 2014	Apr. 09, 2014
		Subsequent Event
		Universities
Subsequent Event [Line Items]	'	'
Maximum number of universities acquired company serving students in nationwide	'	500
Average money students save per year	'	$2,500
Acquisition price paid in cash	500,000	14,000,000
Common stock issued for acquisition	'	250,000
Business combination fair value	'	$1,600,000
Shares of common stock issuable to founder as an earn-out payment upon achievement of certain performance milestones	'	250,000