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Share Based Payments - Summary of Stock Options Outstanding and Exercisable (Detail) - $ / shares
 9 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding 1,969,000 2,448,646 1,335,072
Exercise Price $ 6.00 $ 7.35 $ 5.40
Number of Options Exercisable   1,451,739  
Employee and Director Stock Options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   2,016,646  
Grant Date Fair Value 2.60 $ 4.34  
Number of Options Exercisable   1,110,739  
Employee and Director Stock Options | Option One      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   360,000  
Expiration Date   Jun. 18, 2019  
Options Outstanding Remaining Contractual Life (In Years)   1 year 5 months 15 days  
Exercise Price   $ 3.00  
Grant Date Fair Value   $ 1.00  
Number of Options Exercisable   360,000  
Employee and Director Stock Options | Option Two      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   80,000  
Expiration Date   Jun. 18, 2019  
Options Outstanding Remaining Contractual Life (In Years)   1 year 5 months 15 days  
Exercise Price   $ 3.00  
Grant Date Fair Value   $ 1.32  
Number of Options Exercisable   80,000  
Employee and Director Stock Options | Option Three      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   20,000  
Expiration Date   Dec. 08, 2019  
Options Outstanding Remaining Contractual Life (In Years)   1 year 11 months 8 days  
Exercise Price   $ 14.60  
Grant Date Fair Value   $ 6.55  
Number of Options Exercisable   20,000  
Employee and Director Stock Options | Option Four      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   80,000  
Expiration Date   Dec. 08, 2019  
Options Outstanding Remaining Contractual Life (In Years)   1 year 11 months 8 days  
Exercise Price   $ 14.80  
Grant Date Fair Value   $ 6.46  
Number of Options Exercisable   80,000  
Employee and Director Stock Options | Option Five      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   20,000  
Expiration Date   Mar. 16, 2020  
Options Outstanding Remaining Contractual Life (In Years)   2 years 2 months 15 days  
Exercise Price   $ 16.00  
Grant Date Fair Value   $ 7.09  
Number of Options Exercisable   20,000  
Employee and Director Stock Options | Option Six      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   8,500  
Expiration Date   Aug. 14, 2020  
Options Outstanding Remaining Contractual Life (In Years)   2 years 7 months 13 days  
Exercise Price   $ 4.90  
Grant Date Fair Value   $ 1.94  
Number of Options Exercisable   8,500  
Employee and Director Stock Options | Option Seven      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   150,000  
Expiration Date   Oct. 21, 2020  
Options Outstanding Remaining Contractual Life (In Years)   2 years 9 months 21 days  
Exercise Price   $ 4.20  
Grant Date Fair Value   $ 1.80  
Number of Options Exercisable   112,500  
Employee and Director Stock Options | Option Eight      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   20,000  
Expiration Date   Dec. 31, 2020  
Options Outstanding Remaining Contractual Life (In Years)   3 years  
Exercise Price   $ 6.20  
Grant Date Fair Value   $ 2.49  
Number of Options Exercisable   20,000  
Employee and Director Stock Options | Option Nine      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   595,000  
Expiration Date   Jul. 13, 2020  
Options Outstanding Remaining Contractual Life (In Years)   2 years 6 months 10 days  
Exercise Price   $ 6.95  
Grant Date Fair Value   $ 3.23  
Number of Options Exercisable   396,666  
Employee and Director Stock Options | Option Ten      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   20,000  
Expiration Date   Aug. 08, 2020  
Options Outstanding Remaining Contractual Life (In Years)   2 years 7 months 9 days  
Exercise Price   $ 6.55  
Grant Date Fair Value   $ 3.23  
Number of Options Exercisable   10,000  
Employee and Director Stock Options | Option Eleven      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   617,000  
Expiration Date   Apr. 17, 2027  
Options Outstanding Remaining Contractual Life (In Years)   9 years 3 months 18 days  
Exercise Price   $ 10.80  
Grant Date Fair Value   $ 7.76  
Employee and Director Stock Options | Option Twelve      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   6,146  
Expiration Date   May 18, 2027  
Options Outstanding Remaining Contractual Life (In Years)   9 years 4 months 17 days  
Exercise Price   $ 10.00  
Grant Date Fair Value   $ 5.23  
Number of Options Exercisable   3,073  
Employee and Director Stock Options | Option Thirteen      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   10,000  
Expiration Date   May 18, 2027  
Options Outstanding Remaining Contractual Life (In Years)   9 years 4 months 17 days  
Exercise Price   $ 10.00  
Grant Date Fair Value   $ 7.63  
Employee and Director Stock Options | Option Fourteen      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   30,000  
Expiration Date   Aug. 08, 2027  
Options Outstanding Remaining Contractual Life (In Years)   9 years 7 months 9 days  
Exercise Price   $ 13.15  
Grant Date Fair Value   $ 8.86  
Non-employee Stock Options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   432,000  
Grant Date Fair Value $ 3.23 $ 3.88  
Number of Options Exercisable   341,000  
Non-employee Stock Options | Option One      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   160,000  
Expiration Date   Jun. 18, 2019  
Options Outstanding Remaining Contractual Life (In Years)   1 year 5 months 15 days  
Exercise Price   $ 3.00  
Grant Date Fair Value   $ 1.32  
Number of Options Exercisable   160,000  
Non-employee Stock Options | Option Two      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   30,000  
Expiration Date   Dec. 08, 2019  
Options Outstanding Remaining Contractual Life (In Years)   1 year 11 months 8 days  
Exercise Price   $ 14.60  
Grant Date Fair Value   $ 8.25  
Number of Options Exercisable   30,000  
Non-employee Stock Options | Option Three      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   82,000  
Expiration Date   Oct. 03, 2020  
Options Outstanding Remaining Contractual Life (In Years)   2 years 9 months 3 days  
Exercise Price   $ 6.75  
Grant Date Fair Value   $ 4.00  
Number of Options Exercisable   41,000  
Non-employee Stock Options | Option Four      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   110,000  
Expiration Date   Oct. 28, 2020  
Options Outstanding Remaining Contractual Life (In Years)   2 years 9 months 29 days  
Exercise Price   $ 4.20  
Grant Date Fair Value   $ 2.20  
Number of Options Exercisable   110,000  
Non-employee Stock Options | Option Five      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   20,000  
Expiration Date   May 18, 2027  
Options Outstanding Remaining Contractual Life (In Years)   9 years 4 months 17 days  
Exercise Price   $ 10.00  
Grant Date Fair Value   $ 8.69  
Non-employee Stock Options | Option Six      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   15,000  
Expiration Date   Aug. 08, 2027  
Options Outstanding Remaining Contractual Life (In Years)   9 years 7 months 9 days  
Exercise Price   $ 13.15  
Grant Date Fair Value   $ 11.70  
Non-employee Stock Options | Option Seven      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding   15,000  
Expiration Date   Nov. 06, 2027  
Options Outstanding Remaining Contractual Life (In Years)   9 years 10 months 6 days  
Exercise Price   $ 20.65  
Grant Date Fair Value   $ 19.93