Stock-Based Compensation - Stock Options (Details)	9 Months Ended
Nov. 30, 2019 USD ($) installment $ / shares	Dec. 01, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested stock options	$ 3,300,000
Weighted average remaining contractual term (in years)	4 years 2 months 12 days
Aggregate intrinsic value for options outstanding	$ 0
Weighted average remaining contractual term for options exercisable (in years)	3 years 1 month 6 days
Aggregate intrinsic value of options exercisable	$ 0
Number of stock options exercised	$ 0	$ 0
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition, weighted average period	2 years 10 months 24 days
The 2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value for stock options granted (in dollars per share) \| $ / shares	$ 4.18	$ 4.31
The 2012 Plan [Member] \| Employee Stock Option Issued Since May 10, 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period (in years)	8 years
Minimum [Member] \| The 2012 Plan [Member] \| Employee Stock Option Issued Since May 10, 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, number of equal annual installments \| installment	3
Minimum [Member] \| The 2012 Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, number of equal annual installments	3
Maximum [Member] \| The 2012 Plan [Member] \| Employee Stock Option Issued Since May 10, 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, number of equal annual installments \| installment	5
Maximum [Member] \| The 2012 Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, number of equal annual installments	5

Share-based Compensation Arrangement by Share-based Payment Award, Vesting Period, Number of Equal Annual Installments

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Value of stock issued as a result of the exercise of stock options.

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