Annual report pursuant to Section 13 and 15(d)

Segment Information and Geographic Information - Geographical Data for Operations (Detail)

v3.8.0.1
Segment Information and Geographic Information - Geographical Data for Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue:                      
Net revenues $ 8,426 $ 7,522 $ 6,558 $ 5,784 $ 4,757 $ 4,462 $ 4,198 $ 3,830 $ 28,290 $ 17,247 $ 13,459
United States [Member]                      
Revenue:                      
Net revenues                 21,977 13,641 10,519
International [Member]                      
Revenue:                      
Net revenues                 $ 6,313 $ 3,606 $ 2,940