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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 07, 2017
Jan. 27, 2017
Jun. 29, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jun. 28, 2016
Oct. 12, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Convertible preferred stock, shares authorized       10,000,000   10,000,000   10,000,000    
Convertible preferred stock, par value (in dollars per share)       $ 0.001   $ 0.001   $ 0.001    
Shares issued for acquisitions (in shares) 18,916,940                  
Shares issued for an investment (in shares) 8,333,333                  
Stock sold price per share (in dollars per share) $ 0.96                  
Proceeds from issuance of common stock           $ 10,000 $ 70      
Stock-based compensation expense       $ 443 $ 218 $ 628 354      
Weighted average grant date fair value per option granted (in dollars per share)           $ 0.61   $ 0.81    
Future stock-based compensation for unvested employee options granted and outstanding       2,000   $ 2,000        
Stock options outstanding, intrinsic value       $ 0   $ 0        
Liquidated damages amount percent of VWAP (percent)           1.00%        
Warrants Issued in 2009 to Purchase Common Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price of warrants (in dollars per share)       $ 21.60   $ 21.60        
Warrants outstanding (in shares)       9,259   9,259        
Warrants term           10 years        
Series D Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price of warrants (in dollars per share)     $ 1.75           $ 2.46  
Warrants outstanding (in shares)                   2,810,812
Liquidated damages amount percent of VWAP (percent)           1.00%        
Warrants term     5 years              
Warrants to Purchase Stock [Member] | 2010 and 2012 Convertible Promissory Notes [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price of warrants (in dollars per share)       $ 4.87   $ 4.87        
Warrants outstanding (in shares)       510,350   510,350        
Warrants term           10 years        
Underwriter [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price of warrants (in dollars per share)       $ 7.14   $ 7.14        
Warrants outstanding (in shares)       82,500   82,500        
Warrants term           10 years        
Employee Stock Purchase Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares available for grant       139,839   139,839        
Percentage of outstanding stock maximum           1.00%        
Additional shares authorized (in shares)           279,680        
Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Ownership interest of voting rights of all classes of stock (percent)       10.00%   10.00%        
NSO [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of fair market value           85.00%        
Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period           4 years        
Income tax benefit from stock compensation expense           $ 0 $ 0      
Number of options granted (in shares)           3,113,777        
Future stock-based compensation, requisite service period           3 years        
Number of shares available for grant       7,553,936   7,553,936   958,856    
Additional shares authorized (in shares)           671,478        
Stock Options [Member] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of fair market value           110.00%        
Stock Options [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Contractual term of option           10 years        
ISOs [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Contractual term of option           5 years        
Common Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares issued upon conversion (in shares)       601,000            
Series B Convertible Preferred Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Convertible preferred stock, shares issued       12,179   12,179   12,780    
Number of shares converted (in shares)       601            
Convertible preferred stock, shares outstanding       12,179   12,179   12,780    
Sabby Management, LLC [Member] | Common Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Ownership interest (percent)       4.99%   4.99%        
2015 Sabby Purchase Agreement [Member] | Series D Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price of warrants (in dollars per share)                   $ 2.46
2016 Sabby Purchase Agreement [Member] | Series D Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Warrants outstanding (in shares)     2,702,704              
2016 Sabby Purchase Agreement [Member] | Series B Convertible Preferred Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Convertible preferred stock, shares issued       13,780   13,780        
Convertible preferred stock, par value (in dollars per share)       $ 0.001   $ 0.001        
Convertible preferred stock, stated value (in dollars per share)       $ 1,000   $ 1,000        
Aspire Capital Fund, LLC [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock sold price per share (in dollars per share) $ 0.96                  
Proceeds from issuance of common stock $ 2,000 $ 2,000                
Shares issued during period (in shares) 2,083,333 708,333                
Maxim Group Llc [Member] | 2016 Sabby Purchase Agreement [Member] | Series D Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price of warrants (in dollars per share)     $ 1.75           $ 2.46  
Warrants outstanding (in shares)     120,000             108,108
Warrants term     5 years              
Essentialis, Inc. [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Proceeds from issuance of common stock $ 8,000                  
Indemnification Claims [Member] | Essentialis, Inc. [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares issued for acquisitions (in shares) 913,379                  
Development Milestone [Member] | Essentialis, Inc. [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares issued for acquisitions (in shares) 4,566,948