Stock-Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended |
In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2015 | Jun. 16, 2014 | Aug. 18, 2014 | Jul. 07, 2014 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Stock-based compensation expense, net of tax | $158 | $104 | $535 | $320 | | | | | |
Stock-based compensation expense, net of tax, per diluted share | $0.02 | $0.01 | $0.05 | $0.03 | | | | | |
Shares of common stock granted | 245,376 | | 245,376 | | | | | | |
Options vesting period, beginning one year after the date of the grant | | | 3 years | | | | | | |
Number of Shares, Granted | | | 440,000 | | 158,000 | | | | |
Options valued by Black Scholes pricing model | | | | | 19,000 | | | | |
Exercise of stock options | | | 662 | 677 | | | | | |
Aggregate intrinsic value of options exercised | | | 339 | | | | | | |
Unrecognized compensation cost related to stock options granted-but-not-yet-vested that are expected to become exercisable | 1,068 | | 1,068 | | | | | | |
Weighted-average period cost is to be recognized | | | 1 year | | | | | | |
Forfeiture provisions lapse period for non-employee directors | | | 1 year | | | | | | |
Transfer restrictions lapse period for non-employee directors | | | 6 months | | | | | | |
Unrecognized compensation cost related to non-vested restricted stock awards | 231 | | 231 | | | | | | |
Scenario, Forecast | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Number of Shares, Granted | | | | | | 440,000 | | | |
Options valued by Black Scholes pricing model | | | | | | 55,000 | | | |
Employee Stock Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Stock option compensation expense | | | 681 | | 362 | | | | |
Taxes related to stock option compensation expense | | | 252 | | 138 | | | | |
Weighted-average period cost is to be recognized | | | 2 years | | | | | | |
Restricted Stock | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Stock option compensation expense | | | 168 | | 155 | | | | |
Taxes related to stock option compensation expense | | | $62 | | 59 | | | | |
Black Scholes Based Option Pricing Model | 2015 $4.61 Value Per Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | $4.61 | | | | | | |
Black Scholes Based Option Pricing Model | 2015 $4.61 Value Per Option | Scenario, Forecast | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | | | | 4.61 | | | |
Black Scholes Based Option Pricing Model | 2015 $3.85 Value Per Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | $3.85 | | | | | | |
Black Scholes Based Option Pricing Model | 2015 $3.85 Value Per Option | Scenario, Forecast | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | | | | 3.85 | | | |
Black Scholes Based Option Pricing Model | 2015 $3.72 Value Per Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | $3.72 | | | | | | |
Black Scholes Based Option Pricing Model | 2015 $3.72 Value Per Option | Scenario, Forecast | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | | | | 3.72 | | | |
Black Scholes Based Option Pricing Model | 2014 $3.03 Value Per Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | $3.03 | | 3.03 | | | | |
Black Scholes Based Option Pricing Model | 2014 $3.01 Value Per Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | $3.01 | | 3.01 | | | | |
Monte Carlo Simulation | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Number of Shares, Granted | | | | | 139,000 | | | | |
Monte Carlo Simulation | Scenario, Forecast | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Number of Shares, Granted | | | | | | 385,000 | | | |
Monte Carlo Simulation | 2015 $3.05 Value Per Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | $3.05 | | | | | | |
Monte Carlo Simulation | 2015 $3.05 Value Per Option | Scenario, Forecast | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | | | | 3.05 | | | |
Monte Carlo Simulation | 2015 $2.49 Value Per Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | $2.49 | | | | | | |
Monte Carlo Simulation | 2015 $2.49 Value Per Option | Scenario, Forecast | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | | | | 2.49 | | | |
Monte Carlo Simulation | 2014 $1.90 Value Per Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | $1.90 | | 1.9 | | | | |
Monte Carlo Simulation | 2014 $1.71 Value Per Option | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Weighted-average value per option granted | | | $1.71 | | 1.71 | | | | |
Chief Financial Officer | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Number of Shares, Granted | | | | | | | 200,000 | | |
Weighted-average value per option granted | | | | | | | $12.78 | | |
Vice President | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Number of Shares, Granted | | | | | | | | 200,000 | |
Weighted-average value per option granted | | | | | | | | $10.40 | |
Maximum | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Expiration period | | | 10 years | | | | | | |
2012 Plan | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Shares of common stock granted | 750,000 | | 750,000 | | | | | | |
Shares of common stock granted, expiration date | | | 31-Oct-22 | | | | | | |
2012 Plan | Chief Financial Officer | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Number of Shares, Granted | | | | | | | | | 150,000 |
2006 Plan | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Shares of common stock granted | 500,000 | | 500,000 | | | | | | |
Shares of common stock granted, expiration date | | | 31-Jul-16 | | | | | | |
2006 Plan | Chief Financial Officer | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Number of Shares, Granted | | | | | | | | | 50,000 |
2004 Plan | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | |
Shares of common stock granted, expiration date | | | 30-Sep-14 | | | | | | |