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Stock Options and Restricted Stock - Summary of Activity for Restricted Stock Programs (Detail) - $ / shares
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares, granted     24,000 12,000  
Grant price per share, cancelled $ 9.22       $ 10.94
Grant price per share, vested, lower limit 2.22        
Grant price per share, vested, upper limit $ 9.38        
Restricted Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares, beginning balance 207,995 408,582 408,582 167,703 167,703
Grant price per share, granted $ 3.93 $ 4.39      
Number of shares, granted 212 97,952 98,164 258,232 327,251
Grant price per share, cancelled $ 3.93        
Number of shares, cancelled (199) (2,226)     (8,988)
Grant price per share, vested $ 0        
Number of shares, vested   (296,313)     (77,384)
Number of shares, ending balance 208,008 207,995 208,008   408,582
Grant price per share, lower range limit beginning balance $ 2.06 $ 2.06 $ 2.06 $ 3.95 $ 3.95
Grant price per share, upper range limit beginning balance 7.98 10.38 10.38 13.46 13.46
Grant price per share, cancelled, lower limit   3.93     2.14
Grant price per share, cancelled, upper limit   9.08     10.08
Grant price per share, vested, lower limit   2.06     9.08
Grant price per share, vested, upper limit   10.38     13.46
Grant price per share, lower range limit ending balance 2.06 2.06 2.06   2.06
Grant price per share, upper range limit ending balance 13.84 7.98 13.84   10.38
Weighted average grant price beginning balance 4.16 3.45 3.45 $ 8.88 8.88
Weighted average grant price, granted 3.93 4.39     2.48
Weighted average grant price, cancelled 3.93 5.86     3.07
Weighted average grant price, vested   3.24     11.09
Weighted average grant price, ending balance $ 7.45 $ 4.16 $ 7.45   3.45
Restricted Shares [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grant price per share, granted         2.06
Restricted Shares [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grant price per share, granted         $ 3.93