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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
Value of Initial Fixed S100
Investment Based On:
Fiscal Year
Summary Compensation Table Total for PEO(1)
($)
Compensation Actually Paid to PEO(2)
($)
Average Summary Compensation Table Total for non-PEO NEOs(1)
($)
Average Compensation Actually Paid to non-PEO NEOS(3)
($)
Total Stockholder Return
($)
Peer Group Total Stockholder Return(4)
($)
Net Income (Loss) (in thousands)
($)
Adjusted EBITDA
(in thousands)(5)
($)
(a)(b)(c)(d)(e)(f)(g)(h)(i)
202212,087,1644,776,0375,471,6912,348,12067.34116.65266,638254,525
202121,005,605(2,978,784)9,280,385(826,037)80.98174.36(1,458)265,859
202010,381,08036,270,8754,285,86113,669,798238.27143.64(6,221)207,058
    
Company Selected Measure Name Adjusted EBITDA    
Named Executive Officers, Footnote [Text Block] For 2022, 2021 and 2020, the PEO is Dan Rosensweig. The non-PEO NEOs in each of 2022, 2021 and 2020 were Andrew Brown, Nathan Schultz, John Fillmore and Esther Lem.    
PEO Total Compensation Amount $ 12,087,164 $ 21,005,605 $ 10,381,080
PEO Actually Paid Compensation Amount $ 4,776,037 (2,978,784) 36,270,875
Adjustment To PEO Compensation, Footnote [Text Block] To calculate CAP to the PEO in column (c) the following amounts were deducted from and added to the applicable SCT Total Compensation:
Fiscal YearSummary Compensation Table Total for PEO
($)
Deductions from Summary Compensation Table Total(a)
($)
Additions to Summary Compensation Table Total(b)
($)
Compensation Actually Paid to PEO
($)
202212,087,164(10,999,964)3,688,8364,776,037
202121,005,605(19,999,479)(3,984,910)(2,978,784)
202010,381,080(9,374,954)35,264,74936,270,875
(a)Represents the grant date fair value of equity awards reported in the "Stock Awards" column in the Summary Compensation Table for the applicable year.
(b)Reflects the value of equity calculated in accordance with the SEC methodology for determining compensation actually paid under Item 402(v) of Regulation S-K for each year shown. The valuation assumptions used to calculate fair values did not materially differ from those disclosed at the time of grant. The amounts deducted or added in calculating the equity values included in CAP are as follows:
YearYear End Fair Value of Equity Awards Granted in the Year
($)		Year Over Year Change in Fair Value of Outstanding and Unvested Equity Awards
($)		Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year
($)		Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year
($)		Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Year
($)		Value of Dividends or Other Earnings Paid on Stock or Option Awards not Otherwise Reflected in Fair Value or Total Compensation
($)		Equity Value Included in Compensation Actually Paid
($)
(a)(b)(c)(d)(e)(f)(g) = (a) + (b) + (c) + (d) - (e) + (f)
20225,475,069(1,157,413)—(628,820)——3,688,836
20213,939,549(6,908,211)—(1,016,248)——(3,984,910)
202021,597,54211,346,566—2,320,642——35,264,749
    
Non-PEO NEO Average Total Compensation Amount $ 5,471,691 9,280,385 4,285,861
Non-PEO NEO Average Compensation Actually Paid Amount $ 2,348,120 (826,037) 13,669,798
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
(3)To calculate CAP to the non-PEO NEOs in the column (e) the following amounts were deducted from and added to the applicable SCT Total compensation:
Fiscal YearSummary Compensation Table Total for non-PEO NEOs
($)
Deductions from Summary Compensation Table Total(a)
($)
Additions to Summary Compensation Table Total(b)
($)
Compensation Actually Paid to non-PEO NEOs
($)
20225,471,691(4,729,959)1,606,3892,348,120
20219,280,385(8,599,697)(1,506,725)(826,037)
20204,285,861(3,687,465)13,071,40313,669,798
(a)Represents the grant date fair value of equity awards reported in the "Stock Awards" column in the Summary Compensation Table for the applicable year.
(b)Reflects the value of equity calculated in accordance with the SEC methodology for determining compensation actually paid under Item 402(v) of Regulation S-K for each year shown. The valuation assumptions used to calculate fair values did not materially differ from those disclosed at the time of grant. The amounts deducted or added in calculating the equity values included in CAP are as follows:
YearYear End Fair Value of Equity Awards Granted in the Year
($)		Year Over Year Change in Fair Value of Outstanding and Unvested Equity Awards
($)		Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year
($)		Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year
($)		Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Year
($)		Value of Dividends or Other Earnings Paid on Stock or Option Awards not Otherwise Reflected in Fair Value or Total Compensation
($)		Equity Value Included in Compensation Actually Paid
($)
(a)(b)(c)(d)(e)(f)(g) = (a) + (b) + (c) + (d) - (e) + (f)
20222,354,267(493,913)—(253,966)——1,606,389
20211,693,990(2,705,161)—(495,553)——(1,506,725)
20208,494,9953,742,171—834,237——13,071,403
    
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
The chart below reflects the relationship between the PEO and average non-PEO NEO CAP versus our TSR and the NASDAQ Composite Index TSR.
2748779090880
    
Compensation Actually Paid vs. Net Income [Text Block]
The chart below reflects the relationship between the PEO and average non-PEO NEO CAP and our GAAP Net Income.
2748779090886
    
Compensation Actually Paid vs. Company Selected Measure [Text Block]
The chart below reflects the relationship between the PEO CAP and average non-PEO NEO CAP and our Adjusted EBITDA.
3298534904787
    
Total Shareholder Return Amount $ 67.34 80.98 238.27
Peer Group Total Shareholder Return Amount 116.65 174.36 143.64
Net Income (Loss) $ 266,638,000 $ (1,458,000) $ (6,221,000)
Company Selected Measure Amount 254,525,000 265,859,000 207,058,000
PEO Name Dan Rosensweig    
Additional 402(v) Disclosure [Text Block] Reflects TSR indexed to $100 for the Nasdaq Composite Index, which is an industry line peer group reported in the performance graph included in the Company's 2022 Annual Report on Form 10-K.    
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name Chegg Services Revenue    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name Adjusted EBITDA    
Non-GAAP Measure Description [Text Block] Please see page 65 for a definition of Adjusted EBITDA.    
PEO [Member] | Adjustment, Deductions from Summary Compensation Table Total [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (10,999,964) $ (19,999,479) $ (9,374,954)
PEO [Member] | Adjustment, Additions to Summary Compensation Table Total [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 3,688,836 (3,984,910) 35,264,749
PEO [Member] | Adjustment, Year End Fair Value of Equity Awards Granted in the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards 5,475,069 3,939,549 21,597,542
PEO [Member] | Adjustment, Year Over Year Change in Fair Value of Outstanding and Unvested Equity Awards [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards (1,157,413) (6,908,211) 11,346,566
PEO [Member] | Adjustment, Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards 0 0 0
PEO [Member] | Adjustment, Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards (628,820) (1,016,248) 2,320,642
PEO [Member] | Adjustment, Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards 0 0 0
PEO [Member] | Adjustment, Value of Dividends or Other Earnings Paid on Stock or Option Awards not Otherwise Reflected in Fair Value or Total Compensation [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards 0 0 0
Non-PEO NEO [Member] | Adjustment, Deductions from Summary Compensation Table Total [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (4,729,959) (8,599,697) (3,687,465)
Non-PEO NEO [Member] | Adjustment, Additions to Summary Compensation Table Total [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 1,606,389 (1,506,725) 13,071,403
Non-PEO NEO [Member] | Adjustment, Year End Fair Value of Equity Awards Granted in the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards 2,354,267 1,693,990 8,494,995
Non-PEO NEO [Member] | Adjustment, Year Over Year Change in Fair Value of Outstanding and Unvested Equity Awards [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards (493,913) (2,705,161) 3,742,171
Non-PEO NEO [Member] | Adjustment, Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards 0 0 0
Non-PEO NEO [Member] | Adjustment, Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards (253,966) (495,553) 834,237
Non-PEO NEO [Member] | Adjustment, Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards 0 0 0
Non-PEO NEO [Member] | Adjustment, Value of Dividends or Other Earnings Paid on Stock or Option Awards not Otherwise Reflected in Fair Value or Total Compensation [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount, Equity Awards $ 0 $ 0 $ 0