Stock-Based Compensation - Stock Options - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value based on share price	$ 7.12
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options vesting provisions, description	The stock options have a seven-year life and generally vest over a period of four years, 25% after one year, and monthly thereafter.
Options vested in remaining period	4 years
Options vesting percentage after one year	25.00%
Period of termination of employment	90 days
Stock options granted period	7 years
Options exercised | shares	0
Options granted | shares	0
Lower range of exercise prices	$ 5.00
Upper range of exercise prices	$ 11.00
Period of expected life, options granted	5 years
Unrecognized compensation expense | $	$ 0.1
Weighted average period	1 year 2 months 12 days