XML 35 R25.htm IDEA: XBRL DOCUMENT v3.8.0.1
Net Loss Per Share Attributable to Common Stockholders and Members - Additional Information (Detail) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Stock conversion rate   100.00%
Common share equivalents outstanding, excluded from the calculation of diluted net loss per share attributable to common stock holders 233,464 161,055