Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Equity Transactions - Roll Forward of RSU Activity (Detail)

v3.8.0.1
Equity Transactions - Roll Forward of RSU Activity (Detail) - Restricted Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Warrants or restricted shares, Nonvested, Beginning balance 137,244 126,995 128,375
Restricted common stock granted 372,711 43,332 11,440
Number of restricted shares, Vested (182,744) (33,083) (12,820)
Number of Warrants or restricted shares, Nonvested, Ending balance 327,211 137,244 126,995
Weighted average grant date fair value, Nonvested, Beginning balance $ 3.59 $ 3.10 $ 3.06
Weighted average grant date fair value, Granted 7.27 8.49 5.08
Weighted average grant date fair value, Vested 4.50 8.13 4.56
Weighted average grant date fair value, Nonvested, Ending balance $ 7.27 $ 3.59 $ 3.10