Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.19.3
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 06, 2019
Jun. 06, 2019
Mar. 06, 2019
Sep. 06, 2018
Aug. 21, 2018
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Class of Stock [Line Items]                          
Net proceeds from stock issuance                 $ 5,316 $ 246 $ 17,531 $ 32,782  
Warrants outstanding           1,297,151     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                     231,758    
Number of shares cancelled in connection with forfeiture of restricted stock                     779    
Common Stock [Member]                          
Class of Stock [Line Items]                          
Common stock shares issued                 1,103,937   2,772,600 1,955,000  
Net proceeds from stock issuance                 $ 1   $ 3 $ 2  
Stock issuance costs                     $ 601    
Common Stock [Member] | Performance Bridge [Member]                          
Class of Stock [Line Items]                          
Business acquisition, shares issued or issuable         349,072           580,713    
Common Stock [Member] | Machine Box, Inc. [Member]                          
Class of Stock [Line Items]                          
Business acquisition, shares issued or issuable 161,939 97,082 135,583 128,300                  
Business acquisition, additional shares issued or issuable           129,552 77,666 108,469     315,687