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Stock-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended |
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 2009 Stock Option Plan [Member] | Mar. 31, 2013 2009 Stock Option Plan [Member] | Dec. 31, 2013 2009 Stock Option Plan [Member] | Mar. 31, 2014 2009 Stock Option Plan [Member] Minimum [Member] | Mar. 31, 2014 2009 Stock Option Plan [Member] Maximum [Member] | May 02, 2014 2009 Stock Option Plan [Member] Subsequent Event [Member] | Feb. 28, 2014 2014 Equity Incentive Plan [Member] | Mar. 31, 2014 2014 Equity Incentive Plan [Member] | Mar. 31, 2014 2014 Equity Incentive Plan [Member] Maximum [Member] | Feb. 28, 2014 2014 Employee Stock Purchase Plan [Member] | Mar. 31, 2014 2014 Employee Stock Purchase Plan [Member] | Mar. 31, 2014 2014 Employee Stock Purchase Plan [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of exercise price |  |  |  |  |  |  | 100.00% | 110.00% |  |  |  |  |  |  |
Vesting period of options |  |  |  |  |  |  | 3 years | 4 years |  |  |  |  |  |  |
Expiration period of options |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Compensation cost | $ 110 | $ 42 |  | $ 110 | $ 42 |  |  |  |  |  |  |  |  |  |
Total income tax benefit recognized |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Cash received from option exercised | $ 5 |  |  | $ 5 |  | $ 5 |  |  |  |  |  |  |  |  |
Effective date of equity incentive plan |  |  |  |  |  |  |  |  |  | May 02, 2014 |  |  |  |  |
Number of additional awards expected to be granted |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Number of shares of common stock for future issuance | 2,169,148 |  | 2,120,398 |  |  |  |  |  |  |  |  | 257,352 |  |  |
Equity incentive plan, activity of share reserve, description |  |  |  |  |  |  |  |  |  |  | The share reserve will automatically increase on January 1st of each year, for a period of not more than ten years, commencing on January 1, 2015 and ending on January 1, 2024, in an amount equal to 4.0% of the total number of shares of Capital Stock outstanding on December 31st of the preceding calendar year |  |  |  |
Common stock issuable period |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Common stock outstanding percentage |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  | 0.80% |
Number of shares of common stock for future issuance, board of directors prerogative, increase in period |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |
Effective date of employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  | May 02, 2014 |  |
Number of shares of common stock issuable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,794
Common stock issuable description |  |  |  |  |  |  |  |  |  |  |  |  |  | The number of shares of common stock that are automatically added on January 1st of each year for a period of ten years, commencing on January 1, 2015 and ending on January 1, 2024, in an amount equal to the lesser of (i) 0.8% of the total number of shares of outstanding common stock on December 31 of the preceding calendar year, and (ii) 29,411 shares of common stock |
Common stock issuable period |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |
Employee stock purchase plan, number of shares, which might be added to common stock outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,411 |

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