Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.7.0.1
Summary of Significant Accounting Policies - Additional Information (Detail) - $ / shares
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Common stock price $ 5.76 $ 1.73
Cash and cash equivalents, maturity description 90 days or less  
Short-term contractual maturities 1 year