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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2024
Equity [Abstract]  
Schedule Of Shares Of Common Stock Reserved For Future Issuance As of June 30, 2024, there were 2,805,301 shares of common stock outstanding, and the Company had reserved a total of 1,502,497 of its authorized shares of common stock for future issuance as follows:
Shares Reserved for Future Issuance
Outstanding restricted stock units88,226 
Outstanding performance restricted stock units77,112 
Outstanding stock options100,058 
Reserved for convertible senior notes1,237,101 
Total shares of common stock reserved for future issuance1,502,497 
Schedule Of Stock-based Compensation Expense Included In The Consolidated Statements Of Operations And Comprehensive Loss
The following table presents stock-based compensation expense related to the 2014 Plan and the ESPP, contained on the following line items on the Company’s condensed consolidated statements of operations and comprehensive loss for each of the periods indicated.
 Three Months Ended
June 30,
Six Months Ended
June 30,
 2024202320242023
 (in thousands)
Curriculum and teaching$95 $51 $135 $91 
Servicing and support1,118 2,239 2,592 5,516 
Technology and content development393 1,960 1,002 3,617 
Marketing and sales695 1,369 1,208 2,523 
General and administrative2,210 5,364 4,898 13,799 
Total stock-based compensation expense$4,511 $10,983 $9,835 $25,546 
Schedule Of Restricted And Performance Restricted Stock Unit Activity
The following table presents a summary of the Company’s RSU activity, adjusted on a retroactive basis to reflect the Reverse Stock Split, for the period indicated. No RSUs were granted during the six months ended June 30, 2024.
 Number of
Units
Weighted-
Average Grant
Date Fair Value per Share
Outstanding balance as of December 31, 2023152,911 $244.00 
Granted— — 
Vested(41,006)282.01 
Forfeited(23,679)210.69 
Outstanding balance as of June 30, 202488,226 $235.27 
The following table presents a summary of the Company’s PRSU activity, adjusted on a retroactive basis to reflect the Reverse Stock Split, for the period indicated.
 Number of
Units
Weighted-
Average Grant
Date Fair Value per Share
Outstanding balance as of December 31, 202327,695 $403.04 
Granted59,293 13.12 
Vested— — 
Forfeited(9,876)11.98 
Outstanding balance as of June 30, 202477,112 $153.31 
Schedule Of Assumptions Used For Estimating The Fair Value Of The Stock Options Granted
The following tables present a summary of (i) for the six months ended June 30, 2024 and 2023, the assumptions used for estimating the fair values of the TSR-performance component of the PRSUs, and (ii) for the six months ended June 30, 2024, the assumptions used for estimating the fair value of the PRSUs subject to market-based vesting conditions. As of June 30, 2024 and December 31, 2023, there were 14,036 and 40,910 outstanding PRSUs for which the performance metrics had not been defined as of each respective date. Accordingly, such awards are not considered granted for accounting purposes as of June 30, 2024 and December 31, 2023, and have been excluded from the tables below. No PRSUs were granted during each of the three months ended June 30, 2024 and 2023.
Six Months Ended
June 30,
 20242023
Risk-free interest rate5.11%4.68%
Expected term (years)1.001.00
Expected volatility162%108%
Dividend yield0%0%
 Six Months Ended
June 30, 2024
Risk-free interest rate4.33%
Expected term (years)1.30
Expected volatility126%
Dividend yield0%
The following table summarizes the assumptions used for estimating the fair value of the stock options granted for the period presented. No stock options were granted during the six months ended June 30, 2024 or the three months ended June 30, 2023.
Six Months Ended
June 30, 2023
Risk-free interest rate3.6%
Expected term (years)5.69
Expected volatility87%
Dividend yield0%
Weighted-average grant date fair value per share$147.90
Schedule Of Stock Option Activity
The following table presents a summary of the Company’s stock option activity, adjusted on a retroactive basis to reflect the Reverse Stock Split, for the period indicated.
 Number of
Options
Weighted-Average
Exercise Price per
Share
Weighted-Average
Remaining
Contractual Term
(in years)
Aggregate
Intrinsic
Value
(in thousands)
Outstanding balance as of December 31, 2023135,176 $838.34 4.63$— 
Granted— — 0.00
Exercised— — 0.00
Forfeited(4,787)305.40 
Expired(30,331)592.77 
Outstanding balance as of June 30, 2024100,058 938.27 4.62— 
Exercisable as of June 30, 202485,523 $1,025.12 4.16$—