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Stockholders' Equity and Share-Based Compensation - Additional Information 3 (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended
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Sep. 30, 2013 Employees | Jun. 28, 2014 | Jun. 28, 2014 Warrants [Member] | Jun. 28, 2014 Warrants [Member] | Jun. 28, 2014 Warrants Exercise Price One [Member] Warrants [Member] | Jun. 28, 2014 Warrants Exercise Price Two [Member] Warrants [Member] | Jul. 31, 2013 Stock Option Exchange Program [Member] | Jun. 28, 2014 Stock Option Exchange Program [Member] | Jun. 28, 2014 Stock Option Exchange Program [Member] Stock Options Vest One Year [Member] | Jun. 28, 2014 Stock Option Exchange Program [Member] Vest After One Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of shares issued under exchange program |  | $ 2.00 |  |  |  |  | $ 4.00 |  |  |
Option exchange ratio |  |  |  |  |  |  |  | $ 3.5 |  |
Shares issued under exchange program |  |  |  |  |  |  | 3,733,000 |  |  |
Stock option exercise price, minimum |  |  |  |  |  |  | $ 4.01 |  |  |
Stock option exercise price, maximum |  |  |  |  |  |  | $ 11.68 |  |  |
Option grant vesting period |  |  |  |  |  |  |  | 4 years |  |
Stock options vesting, description |  |  |  |  |  |  |  | The terms and conditions of the new options are subject to an entirely new four year vesting schedule where 25% will vest on the first anniversary, and the remaining 75% will vest monthly over the following 36 months. All new options have a ten year contractual term. |  |
Stock options vested, percentage |  |  |  |  |  |  |  |  | 25.00% | 75.00%
Stock options contractual term |  | 4 years 6 months |  |  |  |  |  | 10 years |  |
Stock options exercisable, number | 3,475,000 |  |  |  |  |  |  |  |  |
Stock options exercised, weighted average exercise price | $ 6.65 |  |  |  |  |  |  |  |  |
Eligible employees | 45 |  |  |  |  |  |  |  |  |
Option unvested exercisable number | 993,000 |  |  |  |  |  |  |  |  |
Options unvested exercise price | $ 0.9866 |  |  |  |  |  |  |  |  |
Incremental fair value on the date of exchange | $ 422 |  |  |  |  |  |  |  |  |
Vesting period of the new options |  | 4 years |  |  |  |  |  |  |  |
Outstanding common stock warrants |  |  |  | 50 |  |  |  |  |  |
Common stock warrants issued during period |  |  |  |  | 30 | 20 |  |  |  |
Warrant exercise price for warrants issued during period |  |  |  |  | 2.14 | 8.32 |  |  |  |
Expiration of warrant, date |  |  |  |  | May 05, 2016 | Apr. 27, 2017 |  |  |  |
Warrants exercised during period |  |  |  | 0 |  |  |  |  |  |
Aggregate intrinsic value of outstanding and exercisable warrants |  |  | $ 46 |  |  |  |  |  |  |

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