Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents, Short-Term and Long-Term Investments - Additional Information (Detail)

v3.19.1
Cash, Cash Equivalents, Short-Term and Long-Term Investments - Additional Information (Detail)
3 Months Ended
Mar. 31, 2019
Maximum [Member]  
Cash Cash Equivalents Short Term And Long Term Investments [Line Items]  
Long-term investments maturity period 2 years