Warrants - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Service agreement termination description	In February 2018, the Company terminated its relationship with a vendor who had been issued warrants to acquire 950,000 shares of common stock (the “Service Warrants”) with staggered vesting requirements. As part of the termination agreement, the Company accelerated the full vesting of the Service Warrants.