Stock-Based Compensation (Detail) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Options granted	1,413,904
Weighted Average Exercise Price Per share, End of year	$ 2.77
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant, Beginning of year	175,046	71,431
Shares Available For Grant, Authorized		250,000
Shares Available For Grant, Options granted	0	(305,000)
Shares Available For Grant, Options forfeited	0	153,095
Shares Available For Grant, Options expired	0	5,520
Shares Available for Grant, End of year	175,046	175,046
Number of Shares, Beginning of Year	514,772	369,887
Number of Shares, Authorized		0
Number of Shares, Options granted	0	305,000
Number Of Shares, Options forfeited	0	(153,095)
Number Of Shares, Options expired	0	(7,020)
Number of Shares, End of Year	514,772	514,772
Number of Shares, Total vested and expected to vest shares (options)	514,772
Number of Shares, Total vested shares (options)	229,279
Weighted Average Exercise Price Per share, Beginning of year	$ 2.77	$ 4.64
Weighted Average Exercise Price Per Share, Authorized		0
Weighted Average Exercise Price Per Share, Options granted	0	1.41
Weighted Average Exercise Price Per Share, Options forfeited	0	3.10
Weighted Average Exercise Price Per Share, Options expired	0	34.72
Weighted Average Exercise Price Per share, End of year	2.77	$ 2.77
Weighted Average Exercise Price Per Share, Total vested and expected to vest shares (options)	2.77
Weighted Average Exercise Price Per Share, Total vested shares (options)	$ 4.16