Stock Options and Stock-Based Compensation - Schedule of Outstanding Stock Options (Detail) (USD $) | 9 Months Ended | | |
Feb. 28, 2014 | Nov. 30, 2013 | 31-May-13 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ' | ' | ' |
Number of Shares, Outstanding Options | 286,666 | 286,666 | 301,666 |
Weighted Average Exercise Price, Outstanding Options | $3.74 | $3.74 | $4.06 |
Weighted Average Remaining Contractual Life (yrs), Outstanding Options | '6 years 1 month 6 days | ' | ' |
Exercisable Options, Number of Shares | 204,998 | ' | ' |
Exercisable Options, Weighted Average Exercise Price | $4.06 | ' | ' |
Options 1 [Member] | ' | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ' | ' | ' |
Number of Shares, Outstanding Options | 41,666 | ' | ' |
Weighted Average Exercise Price, Outstanding Options | $2.30 | ' | ' |
Weighted Average Remaining Contractual Life (yrs), Outstanding Options | '3 months 18 days | ' | ' |
Exercisable Options, Number of Shares | 41,666 | ' | ' |
Exercisable Options, Weighted Average Exercise Price | $2.30 | ' | ' |
Options 2 [Member] | ' | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ' | ' | ' |
Number of Shares, Outstanding Options | 35,000 | ' | ' |
Weighted Average Exercise Price, Outstanding Options | $2.53 | ' | ' |
Weighted Average Remaining Contractual Life (yrs), Outstanding Options | '9 years 7 months 6 days | ' | ' |
Exercisable Options, Number of Shares | 0 | ' | ' |
Options 3 [Member] | ' | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ' | ' | ' |
Number of Shares, Outstanding Options | 25,000 | ' | ' |
Weighted Average Exercise Price, Outstanding Options | $2.90 | ' | ' |
Weighted Average Remaining Contractual Life (yrs), Outstanding Options | '9 years 1 month 6 days | ' | ' |
Exercisable Options, Number of Shares | 0 | ' | ' |
Options 4 [Member] | ' | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ' | ' | ' |
Number of Shares, Outstanding Options | 130,000 | ' | ' |
Weighted Average Exercise Price, Outstanding Options | $3.65 | ' | ' |
Weighted Average Remaining Contractual Life (yrs), Outstanding Options | '7 years 3 months 18 days | ' | ' |
Exercisable Options, Number of Shares | 108,332 | ' | ' |
Exercisable Options, Weighted Average Exercise Price | $3.65 | ' | ' |
Options 5 [Member] | ' | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ' | ' | ' |
Number of Shares, Outstanding Options | 5,000 | ' | ' |
Weighted Average Exercise Price, Outstanding Options | $5.80 | ' | ' |
Weighted Average Remaining Contractual Life (yrs), Outstanding Options | '1 year 8 months 12 days | ' | ' |
Exercisable Options, Number of Shares | 5,000 | ' | ' |
Exercisable Options, Weighted Average Exercise Price | $5.80 | ' | ' |
Options 6 [Member] | ' | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ' | ' | ' |
Number of Shares, Outstanding Options | 50,000 | ' | ' |
Weighted Average Exercise Price, Outstanding Options | $6.25 | ' | ' |
Weighted Average Remaining Contractual Life (yrs), Outstanding Options | '4 years 3 months 18 days | ' | ' |
Exercisable Options, Number of Shares | 50,000 | ' | ' |
Exercisable Options, Weighted Average Exercise Price | $6.25 | ' | ' |