Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Current deferred tax assets: | ||
| Total | $ 514 | $ 504 |
| Non-current deferred tax assets: | ||
| Total | 4,237 | 3,357 |
| Valuation allowance | (4,751) | (3,861) |
| Net deferred tax assets | 0 | 0 |
| Deferred Tax Current [Member] | ||
| Current deferred tax assets: | ||
| Allowance for bad debts | 34 | 34 |
| Share-based payment expense | 321 | 220 |
| Allowance for obsolete inventory | 30 | 98 |
| Accrued compensation | 63 | 77 |
| Contribution carryover | 2 | |
| Other accruals | 66 | 73 |
| Deferred Tax Non-current [Member] | ||
| Non-current deferred tax assets: | ||
| Depreciation | 16 | 11 |
| Capital loss | 179 | 179 |
| Net operating loss | 3,991 | 3,118 |
| Credit carryover | $ 51 | $ 49 |