Segment and Enterprise-wide Disclosures - Total Property and Equipment Held by Geography (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment | $ 7,022 | $ 6,878 |
| United States [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment | 5,199 | 4,786 |
| Australia [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment | 1,593 | 1,802 |
| Germany [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment | 170 | 186 |
| Other Countries [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment | $ 60 | $ 104 |