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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Mar. 31, 2018
Share-Based Compensation            
Fair value of vested stock options     $ 1,700 $ 1,500    
Stock-based compensation expense $ 1,284 $ 3,874 3,233 5,231    
T2-Owned Instruments and Components [Member]            
Share-Based Compensation            
Stock-based compensation expense     $ 100 0    
Restricted Stock Units [Member]            
Share-Based Compensation            
Weighted-average period     2 years      
Unrecognized compensation cost related to unvested stock options $ 2,100   $ 2,100      
2006 Stock Option Plan [Member] | Stock Options [Member]            
Share-Based Compensation            
Shares available for grant 1,394,529   1,394,529      
2014 Stock Option Plan [Member] | Stock Options [Member]            
Share-Based Compensation            
Shares available for future issuance under stock incentive plan 823,529   823,529      
Percentage of common shares outstanding 4.00%   4.00%      
Shares available for grant 1,394,529   1,394,529      
2014 Stock Option Plan [Member] | Restricted Stock Units [Member]            
Share-Based Compensation            
Restricted stock units vested     139,629      
Restricted stock units granted     589,142      
Inducement Award Plan [Member]            
Share-Based Compensation            
Shares available for grant 856,999   856,999      
Shares available for authorization           1,625,000
2006 and 2014 Stock Option Plans [Member] | Stock Options [Member]            
Share-Based Compensation            
Aggregate fair value of options granted     $ 2,600 $ 5,000    
Unrecognized compensation cost related to non-vested stock options $ 6,300   $ 6,300      
Weighted-average period     2 years 9 months 18 days      
2006 and 2014 Stock Option Plans and Inducement Plan [Member] | Stock Options [Member]            
Share-Based Compensation            
Weighted average fair value of options granted     $ 1.93 $ 3.51    
2006 and 2014 Stock Option Plans and Inducement Plan [Member] | Restricted Stock Units [Member]            
Share-Based Compensation            
Aggregate fair value of restricted stock units granted     $ 1,900      
2006 and 2014 Stock Option Plans and Inducement Plan [Member] | Restricted Stock Units [Member] | Restricted Stock Units Vested, Reflected As Outstanding Shares [Member]            
Share-Based Compensation            
Restricted stock units vested         78,172  
2006 and 2014 Stock Option Plans and Inducement Plan [Member] | Restricted Stock Units [Member] | Restricted Stock Units Vested, Not Reflected As Outstanding Shares [Member]            
Share-Based Compensation            
Restricted stock units vested         73,172  
2006 and 2014 Stock Option Plans and Inducement Plan [Member] | Restricted Stock Units with Market Condition [Member]            
Share-Based Compensation            
Restricted stock units granted     791,247      
Compensation Cost $ 200 $ 2,500 $ 900 $ 2,700    
Maximum [Member] | 2006 Stock Option Plan [Member] | Stock Options [Member]            
Share-Based Compensation            
Expiration period     10 years      
Vesting period     4 years      
Maximum [Member] | 2014 Stock Option Plan [Member] | Stock Options [Member]            
Share-Based Compensation            
Expiration period     10 years      
Vesting period     4 years