Commitments and Contingencies - Additional Information (Detail)	1 Months Ended		9 Months Ended
	Mar. 31, 2015 USD ($)	Feb. 28, 2015	Sep. 30, 2017 USD ($) ft²
Commitment And Contingencies [Line Items]
Area of corporate headquarters and manufacturing facility | ft²			57,000
Extended lease term	Apr. 30, 2020
Provisions for tenant improvement allowance, maximum	$ 398,000
Capital lease agreement term for information technology equipment		30 months
Future minimum lease payments under capital lease, borrowing rate			1.60%
Capital lease prepayment			$ 14,000
Future minimum lease payments under capital lease including net minimum lease payment for year ended December 31, 2017			17,000
Capital lease obligation, long-term			0
Purchase commitments pending			12,800,000
Employee Arrangements and Other Compensation
Commitment And Contingencies [Line Items]
Change in control, if occurs, may require severance benefits payable			1,300,000
Accrued for performance bonuses			$ 67,000