Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($) Customer
Money Market Funds
Cash and cash equivalents fair value disclosure | $	$ 35,600,000
Customer Concentration Risk | Revenue
Number of customers above 10% threshold | Customer	0
Customer Concentration Risk | Accounts Receivable
Number of customers above 10% threshold | Customer	0
Maximum
Cash and cash equivalent, FDIC insured amount | $	$ 250,000