Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.7.0.1
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2017
Mar. 31, 2017
Jun. 30, 2017
May 26, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Net proceeds from issuance of common stock, after deducting offering expenses     $ 81,562  
Common Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Net proceeds from issuance of common stock, after deducting offering expenses $ 78,100      
Total shares issued 11,500,000      
Public offering price of common stock issued $ 7.25      
ATM Agreement [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock issuable and sellable under offering agreement       $ 75,000
ATM Agreement [Member] | Common Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Net proceeds from issuance of common stock, after deducting offering expenses   $ 3,400    
Total shares issued   871,149    
Commission paid to sales agent   $ 100