XML 53 R42.htm IDEA: XBRL DOCUMENT v3.8.0.1
Accrued Liabilities and Deferred Revenue - Additional Information (Detail) - United States
 9 Months Ended
Sep. 30, 2017
Waterlase Laser Systems and Diode Systems | Maximum  
Accrued Liabilities [Line Items]  
Product warrant period 2 years
Waterlase Systems  
Accrued Liabilities [Line Items]  
Product decreased warrant period 1 year