Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
---|---|---|
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | $ 2,824 | $ 2,623 |
Less: accumulated depreciation and amortization | (2,428) | (2,248) |
Property and equipment, net | 396 | 375 |
Machinery and Equipment [Member] | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 1,394 | 1,354 |
Computer Equipment and Software [Member] | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 445 | 310 |
Office Equipment [Member] | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 208 | 202 |
Leasehold Improvements [Member] | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | $ 777 | $ 757 |