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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