Summary of Property, Plant, and Equipment (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|---|
| Property Plant And Equipment [Line Items] | |||
| Property, plant, and equipment gross, excluding land | $ 10,551 | $ 9,883 | |
| Accumulated depreciation | (6,225) | (6,314) | |
| Property, plant, and equipment net, excluding land | 4,326 | 3,569 | |
| Land | 152 | 158 | |
| Property, plant, and equipment, net | 4,478 | 3,727 | $ 1,295 |
| Building | |||
| Property Plant And Equipment [Line Items] | |||
| Property, plant and equipment, gross | 196 | 203 | |
| Leasehold Improvements | |||
| Property Plant And Equipment [Line Items] | |||
| Property, plant and equipment, gross | 2,003 | 2,019 | |
| Equipment and Computers | |||
| Property Plant And Equipment [Line Items] | |||
| Property, plant and equipment, gross | 6,163 | 6,031 | |
| Furniture and Fixtures | |||
| Property Plant And Equipment [Line Items] | |||
| Property, plant and equipment, gross | 599 | 585 | |
| Construction in Progress | |||
| Property Plant And Equipment [Line Items] | |||
| Property, plant and equipment, gross | $ 1,590 | $ 1,045 |