Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.19.1
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Mar. 06, 2019
Sep. 06, 2018
Aug. 21, 2018
Mar. 31, 2019
Jan. 31, 2019
Jun. 30, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Class of Stock [Line Items]                  
Net proceeds from stock issuance           $ 32,780 $ 4,160 $ (64)  
Warrants outstanding       1,297,151     1,297,151   1,297,151
Common Stock and Employee Stock Purchase Plan [Member]                  
Class of Stock [Line Items]                  
Shares issued in connection with stock option exercise             85,017    
Common Stock [Member]                  
Class of Stock [Line Items]                  
Common stock shares issued             662,000    
Stock issuance costs             $ 178    
Shares issued in connection with stock option exercise             20,050    
Common Stock [Member] | Performance Bridge [Member]                  
Class of Stock [Line Items]                  
Business acquisition, shares issued or issuable     349,072   6,482        
Common Stock [Member] | Machine Box, Inc. [Member]                  
Class of Stock [Line Items]                  
Business acquisition, shares issued or issuable 135,583 128,300              
Business acquisition, additional shares issued or issuable       108,469