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Stock Benefit Plans and Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2015 $ / shares shares | Jul. 31, 2014 $ / shares shares | Oct. 31, 2013 USD ($) payment $ / shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares | Nov. 02, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  | 26,125,000 |  |  |
Stock-based compensation expense | $ |  |  |  | $ 2,643 | $ 4,554 | $ 4,078 |
Common stock issued |  |  |  | 102,158,000 | 99,856,000 |  |
Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  | 7,638,000 |  |  |
Weighted-average grant-date fair value of stock options granted | $ / shares |  |  |  | $ 1.28 | $ 0.81 | $ 1.09 |
Share price | $ / shares |  |  |  | $ 0.30 |  |  |
Unrecognized compensation expense for stock options and awards expected to be recognized | $ |  |  |  | $ 2,400 |  |  |
Straight-line basis over a weighted average period |  |  |  | 1 year 9 months |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  | 733,000 |  |  |
Weighted average fair value of awards granted | $ / shares |  |  |  | $ 1.36 | $ 1.32 | $ 1.97 |
Shares awarded in period |  |  |  | 291,000 |  |  |
Performance-based Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  | 2,370,000 |  |  |
Weighted average fair value of awards granted | $ / shares |  |  |  | $ 1.34 |  |  |
Shares awarded in period |  |  |  | 1,854,000 |  |  |
Phantom Share Units (PSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | $ 200 | $ 200 | $ 0 |
2005 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  | 17,400,000 |  |  |
Exercise price of incentive stock options, percent (less than 110%) |  |  |  | 100.00% |  |  |
Exercise price of option granted to stock holder, percent |  |  |  | 10.00% |  |  |
Exercise price of stock options granted to 10 percent stockholder , percent |  |  |  | 110.00% |  |  |
Shares of common stock remained available for issuance |  |  |  | 3,800,000 |  |  |
2005 Plan [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options voting rights, percentage (more than 10%) |  |  |  | 10.00% |  |  |
2005 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options granted expiration term |  |  |  | 10 years |  |  |
2005 Plan [Member] | Incentive stock options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options granted expiration term |  |  |  | 5 years |  |  |
Share based payment award options, vesting period |  |  |  | 4 years |  |  |
2005 Employee, Director and Consultant Stock Plan [Member] | Performance-based Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average fair value of awards granted | $ / shares | $ 1.35 | $ 1.42 |  |  |  |  |
Shares awarded in period | 1,854,000 | 932,000 |  |  |  |  |
2005 Employee, Director and Consultant Stock Plan [Member] | Performance-based Restricted Stock Units [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage |  | 0.00% |  |  |  |  |
2005 Employee, Director and Consultant Stock Plan [Member] | Performance-based Restricted Stock Units [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage |  | 200.00% |  |  |  |  |
Collaborative Arrangement [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share price | $ / shares |  |  | $ 1.95 |  |  |  |
Collaborative arrangement term |  |  | 3 years |  |  |  |
Collaborative arrangement, number of periodic payments | payment |  |  | 3 |  |  |  |
Collaborative arrangement, periodic payment aggregate amount | $ |  |  | $ 8,000 |  |  |  |
Number of days leading up to and including date of signing collaboration agreement for per share price used to calculate annual payments to collaborator |  |  | 5 days |  |  |  |
Number of months of services provided for number of shares issued used to calculate annual payments to collaborator |  |  | 12 months |  |  |  |
Additional liability, common stock issued under agreement | $ |  |  |  |  |  |  | $ 4,900
Additional liability, common stock issued under agreement, due 2017 | $ |  |  |  | $ 2,200 |  |  |
Additional liability, common stock issued under agreement, due 2018 | $ |  |  |  | 2,200 |  |  |
Additional liability, common stock issued under agreement, due 2019 | $ |  |  |  | 500 |  |  |
Contingent liability, shares issuable under agreement | $ |  |  |  | 2,100 |  |  |
Elite Medical Holdings, LLC and Pac 3 Surgical Products, LLC [Member] | Collaborative Arrangement [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | $ 4,900 | $ 1,900 | $ 500 |
Common stock issued |  |  |  |  | 2,780,787 |  |

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