Summary of Significant Accounting Policies - Additional Information (Detail)
|
12 Months Ended |
|
Dec. 31, 2016
USD ($)
Segment
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Nov. 30, 2014
USD ($)
|
| Accounting Policies [Line Items] |
|
|
|
|
| Original maturity of highly liquid investments |
three months
|
|
|
|
| Cash - restricted |
$ 1,308,000
|
$ 0
|
|
|
| Impairment of investment |
|
0
|
|
$ 0
|
| Allowance for bad debt |
70,000
|
228,000
|
|
|
| Depreciation Expense |
$ 4,904,000
|
4,776,000
|
$ 1,081,000
|
|
| Number of operating segment | Segment |
3
|
|
|
|
| Asset Impairment |
$ 275,000
|
|
|
|
| Impairment charges |
0
|
0
|
0
|
|
| Uninsured cash balances |
3,755,000
|
4,978,000
|
|
|
| Research and development costs |
4,877,000
|
4,983,000
|
1,084,000
|
|
| Advertising costs |
$ 1,083,000
|
$ 847,000
|
$ 428,000
|
|
| Lifting Equipment [Member] |
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
| Reporting unit, percentage of fair value in excess of carrying amount |
5.00%
|
|
|
|
| ASV Segment [Member] |
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
| Reporting unit, percentage of fair value in excess of carrying amount |
20.00%
|
|
|
|
| Equipment Distribution [Member] |
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
| Asset Impairment |
$ 275,000
|
|
|
|
| Goodwill Impairment [Member] |
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
| Number of operating segment | Segment |
3
|
|
|
|