Segments and Geographic Information - Summary of Significant Revenues in Following Regions (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Revenues From External Customers And Long Lived Assets [Line Items] | ||||||
| Total revenues | $ 1,815 | $ 1,588 | $ 3,437 | $ 3,237 | $ 7,017 | $ 6,147 |
| North America [Member] | ||||||
| Revenues From External Customers And Long Lived Assets [Line Items] | ||||||
| Total revenues | 1,470 | 1,318 | 2,770 | 2,667 | 5,632 | 4,779 |
| Asia [Member] | ||||||
| Revenues From External Customers And Long Lived Assets [Line Items] | ||||||
| Total revenues | 269 | 162 | 482 | 340 | 943 | 905 |
| Europe [Member] | ||||||
| Revenues From External Customers And Long Lived Assets [Line Items] | ||||||
| Total revenues | 70 | 101 | 160 | 210 | 393 | 355 |
| All Other Regions [Member] | ||||||
| Revenues From External Customers And Long Lived Assets [Line Items] | ||||||
| Total revenues | $ 6 | $ 7 | $ 25 | $ 20 | $ 49 | $ 108 |