Convertible Notes - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands |
|
12 Months Ended |
|
Dec. 19, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Jan. 07, 2015 |
| Debt Instrument [Line Items] |
|
|
|
|
| Deferred tax liability |
|
$ 9,276
|
$ 12,415
|
|
| Convertible note (net) |
|
14,098
|
$ 13,923
|
|
| Debt issuance cost |
|
$ 1,561
|
|
|
| Terex Corporation Note Payable [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Debt instrument, face amount |
$ 7,500
|
|
|
|
| Debenture interest rate |
5.00%
|
|
|
|
| Common stock conversion price |
$ 13.65
|
|
|
|
| Convertible number of common stock |
549,451
|
|
|
|
| Debenture, maturity date |
|
Dec. 19, 2020
|
|
|
| Percentage of debt conversion price |
|
130.00%
|
|
|
| Debt instrument, days before a call is permitted |
|
20 days
|
|
|
| Debt instrument, consecutive trading days |
|
30 days
|
|
|
| Deferred tax liability |
|
$ 321
|
|
|
| Net carrying amount of convertible debt |
|
6,862
|
|
|
| Convertible note discount amortization |
|
255
|
|
|
| Convertible note unamortized discount |
|
$ 638
|
|
|
| Terex Corporation Note Payable [Member] | Convertible Subordinated Debt [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Debt Instrument, Interest Rate, Effective Percentage |
|
7.50%
|
|
|
| Perella Notes Purchase Agreement [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Debt instrument, face amount |
|
|
|
$ 15,000
|
| Deferred tax liability |
|
|
|
257
|
| Net carrying amount of convertible debt |
|
$ 14,490
|
|
|
| Convertible note discount amortization |
|
204
|
|
|
| Convertible note unamortized discount |
|
510
|
|
|
| Convertible note (net) |
|
14,098
|
|
|
| Debt issuance cost |
|
$ 392
|
|
|
| Perella Notes Purchase Agreement [Member] | Convertible Subordinated Debt [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Debt instrument, face amount |
|
|
|
$ 15,000
|
| Common stock conversion price |
|
|
|
$ 15.00
|
| Debt Instrument, Interest Rate, Effective Percentage |
|
7.50%
|
|
|
| Convertible notes, annual coupon rate |
|
|
|
6.50%
|
| Principal amount of convertible notes due date |
|
|
January 7, 2021
|
|