v3.3.1.900

Stockholders' Equity - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2010 USD ($) $ / shares | Dec. 31, 2015 USD ($) Plans $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares | Jun. 30, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Preferred stock, shares authorized |  | 10,000,000 | 10,000,000 |  |
Preferred stock, shares outstanding |  | 0 | 0 |  |
Common stock, shares authorized |  | 40,000,000 | 40,000,000 |  |
Common stock, shares outstanding |  | 14,389,000 | 14,358,000 |  |
Number of equity incentive plans | Plans |  | 2 |  |  |
Shares outstanding under equity incentive plans |  | 1,257,000 | 980,000 |  |
Term of vesting schedule |  | 10 years |  |  |
Vested share exercised |  | 3 months |  |  |
Fair value assumption, risk-free interest rates |  | 1.94% | 1.56% | 1.81% |
Fair value assumption, expected dividend yields |  | 0.00% | 0.00% | 0.00% |
Aggregate intrinsic value closing stock price | $ / shares |  | $ 1.58 |  |  |
Equity ownership percentage to benefit China employees | 38.00% |  |  |  |
Price of warrant | $ / shares | $ 1.00 |  |  |  |
Vesting period of warrant |  | Vesting to occur one-third upon the first anniversary of the warrant and the remaining two-thirds to vest on a monthly basis over the succeeding 24 months. |  |  |
Investment warrants expiration period (years) | 6 years |  |  |  |
Warrant exercise date |  | May 05, 2013 |  |  |
Fair value of options granted | $ / shares |  | $ 1.25 | $ 0.93 | $ 0.58 |
Unrecognized compensation expense related to non-vested stock options | $ |  | $ 407,000 |  |  |
Recognition of unrecognized compensation expense, weighted-average period (in years) |  | 1 year 8 months 12 days |  |  |
Fair value of options that vested | $ |  | $ 205,000 | $ 80,000 | $ 68,000 |
Stock issued during period, stock options exercised |  | 30,000 | 174,000 | 0 |
Cash received from exercise of stock options | $ |  | $ 27,000 | $ 137,000 |  |
Stock options exercise price | $ / shares |  | $ 0.89 | $ 0.79 |  |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period of option granted vest |  | 2 years |  |  |
Fair value assumption, expected volatility |  | 93.00% | 93.00% | 93.00% |
Fair value assumption, expected term (years) |  | 4 years | 4 years | 4 years |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period of option granted vest |  | 3 years |  |  |
Fair value assumption, expected volatility |  | 102.00% | 102.00% | 102.00% |
Fair value assumption, expected term (years) |  | 6 years | 6 years | 6 years |
2006 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares outstanding under equity incentive plans |  | 942,000 |  |  |
Common stock available for future issuance |  | 0 |  |  |
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage |  | 100.00% |  |  |
2015 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares outstanding under equity incentive plans |  | 315,000 |  |  |
Common stock available for future issuance |  | 899,000 |  |  |
Common stock authorized for issuance there-under |  |  |  |  | 1,205,749
2015 Equity Incentive Plan [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock available for future issuance |  | 958,668 |  |  |
Hong Kong Subsidiary [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Value funded to affiliates | $ | $ 1,000,000 |  |  |  |
Agreed additional funding to affiliates | $ | $ 1,000,000 |  |  |  |
Estimated fair value of warrants | $ |  | $ 365,000 |  |  |
Warrant performance period (years) |  | 3 years |  |  |
Stock expenses on equity-based payments related to warrant | $ |  | $ 0 | $ 0 | $ 40,000 |

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